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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.","units":{"USD":[{"end":"2015-12-29","val":5176000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2015Q4I"},{"end":"2016-12-27","val":14622000,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"end":"2016-12-27","val":14622000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2016Q4I"},{"end":"2017-12-26","val":4594000,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"end":"2017-12-26","val":4553000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2017Q4I"},{"end":"2018-12-25","val":8535000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2018Q4I"}]}},"CashAndCashEquivalentsPeriodIncreaseDecrease":{"label":"Cash and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. 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Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. 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Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. 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The receivable is due within one year. For classified balance sheets, this element represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if 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000058","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-07","frame":"CY2018Q1I"},{"end":"2018-06-26","val":9363000,"accn":"0001415301-18-000083","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-27","frame":"CY2018Q2I"},{"end":"2018-09-25","val":7801000,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2018Q3I"},{"end":"2018-12-25","val":6775000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11"},{"end":"2018-12-25","val":6775000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06"},{"end":"2018-12-25","val":6775000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2018Q4I"},{"end":"2019-03-26","val":4060000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1I"},{"end":"2019-06-25","val":5407000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2019Q2I"}]}},"LesseeOperatingLeaseLiabilityPaymentsDue":{"label":"Lessee, 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2019-03-26","val":32213000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1I"},{"end":"2019-06-25","val":34727000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2019Q2I"}]}},"LesseeOperatingLeaseLiabilityPaymentsDueYearFour":{"label":"Lessee, Operating Lease, Liability, to be Paid, Year Four","description":"Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2019-03-26","val":33501000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1I"},{"end":"2019-06-25","val":34844000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2019Q2I"}]}},"LesseeOperatingLeaseLiabilityPaymentsDueYearThree":{"label":"Lessee, Operating Lease, Liability, to be Paid, Year Three","description":"Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2019-03-26","val":33162000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1I"},{"end":"2019-06-25","val":34259000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2019Q2I"}]}},"LesseeOperatingLeaseLiabilityPaymentsDueYearTwo":{"label":"Lessee, Operating Lease, Liability, to be Paid, Year Two","description":"Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2019-03-26","val":32908000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1I"},{"end":"2019-06-25","val":34055000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2019Q2I"}]}},"LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear":{"label":"Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year","description":"Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal 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of Credit Facility, Current Borrowing Capacity","description":"Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.","units":{"USD":[{"end":"2015-06-30","val":15000000,"accn":"0001415301-15-000015","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-23"},{"end":"2015-06-30","val":15000000,"accn":"0001415301-15-000017","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-13","frame":"CY2015Q2I"}]}},"LineOfCreditFacilityIncreaseDecreaseOtherNet":{"label":"Line of Credit Facility, Increase (Decrease), Other, Net","description":"Amount of increase (decrease), classified as other, of the credit 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of Credit Facility, Unused Capacity, Commitment Fee Percentage","description":"The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit 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Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2012-12-25","val":761000,"accn":"0001193125-13-074839","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26"},{"end":"2012-12-25","val":761000,"accn":"0001193125-13-187298","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30"},{"end":"2012-12-25","val":761000,"accn":"0001193125-13-291227","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-16"},{"end":"2012-12-25","val":761000,"accn":"0001562762-13-000314","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-09","frame":"CY2012Q4I"},{"end":"2013-03-19","val":761000,"accn":"0001193125-13-187298","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30","frame":"CY2013Q1I"},{"end":"2013-06-11","val":761000,"accn":"0001193125-13-291227","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-16","frame":"CY2013Q2I"},{"end":"2013-09-03","val":761000,"accn":"0001562762-13-000314","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-09","frame":"CY2013Q3I"},{"end":"2013-12-31","val":761000,"accn":"0001415301-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"end":"2013-12-31","val":761000,"accn":"0001415301-14-000012","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-29"},{"end":"2013-12-31","val":761000,"accn":"0001415301-14-000022","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-22","frame":"CY2013Q4I"},{"end":"2014-03-25","val":761000,"accn":"0001415301-14-000012","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-29","frame":"CY2014Q1I"},{"end":"2014-06-17","val":861000,"accn":"0001415301-14-000022","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-22","frame":"CY2014Q2I"},{"end":"2014-09-09","val":6000000,"accn":"0001415301-14-000024","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-14","frame":"CY2014Q3I"},{"end":"2014-12-30","val":861000,"accn":"0001415301-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014Q4I"}]}},"LongTermDebt":{"label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2011-12-27","val":70000000,"accn":"0001193125-12-394063","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-09-17"},{"end":"2011-12-27","val":70000000,"accn":"0001193125-12-424665","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-16","frame":"CY2011Q4I"},{"end":"2012-06-12","val":61500000,"accn":"0001193125-12-394063","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-09-17","frame":"CY2012Q2I"},{"end":"2017-12-26","val":24477000,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"end":"2017-12-26","val":24477000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2017Q4I"},{"end":"2018-09-25","val":300305000,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2018Q3I"},{"end":"2018-12-25","val":323836000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11"},{"end":"2018-12-25","val":323836000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06"},{"end":"2018-12-25","val":323836000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2018Q4I"},{"end":"2019-03-26","val":339493000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1I"},{"end":"2019-06-25","val":354108000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2019Q2I"}]}},"LongTermDebtAndCapitalLeaseObligationsCurrent":{"label":"Long-term Debt and Lease Obligation, Current","description":"Amount of long-term debt and lease obligation, classified as current.","units":{"USD":[{"end":"2017-12-26","val":0,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"end":"2017-12-26","val":0,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2017Q4I"},{"end":"2018-09-25","val":1706000,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2018Q3I"},{"end":"2018-12-25","val":1714000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2018Q4I"}]}},"LongTermDebtCurrent":{"label":"Long-term Debt, Current Maturities","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2017-12-26","val":0,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"end":"2017-12-26","val":0,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2017Q4I"},{"end":"2018-09-25","val":3100000,"accn":"0001415301-18-000142","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2018Q3I"},{"end":"2018-12-25","val":3100000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11"},{"end":"2018-12-25","val":3100000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06"},{"end":"2018-12-25","val":3100000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2018Q4I"},{"end":"2019-03-26","val":3353000,"accn":"0001415301-19-000050","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1I"},{"end":"2019-06-25","val":3353000,"accn":"0001415301-19-000091","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2019Q2I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive":{"label":"Long-Term Debt, Maturity, after Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2018-12-25","val":321437000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2018Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2018-12-25","val":3100000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2018Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2018-12-25","val":3100000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2018Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2018-12-25","val":3100000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2018Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2018-12-25","val":3100000,"accn":"0001415301-19-000028","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-11","frame":"CY2018Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. 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