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aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.","units":{"USD":[{"start":"2009-02-01","end":"2010-01-31","val":3100000,"accn":"0001088825-12-000048","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23","frame":"CY2009"},{"start":"2010-02-01","end":"2011-01-31","val":2600000,"accn":"0001088825-12-000048","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23","frame":"CY2010"},{"start":"2011-02-01","end":"2012-01-31","val":2700000,"accn":"0001088825-12-000048","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23","frame":"CY2011"}]}},"AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities":{"label":"Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities","description":"The aggregate amount of adjustments to net income or loss necessary to remove the effects of all items whose cash 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The aggregate amount also includes all noncash expenses and income items which reduce or increase net income and are thus added back or deducted when calculating cash provided by or used in operating activities.","units":{"USD":[{"start":"2008-02-01","end":"2009-01-31","val":638000,"accn":"0001088825-11-000032","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-14","frame":"CY2008"},{"start":"2009-02-01","end":"2009-10-31","val":23000,"accn":"0001088825-10-000115","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-12-07"},{"start":"2009-02-01","end":"2010-01-31","val":90000,"accn":"0001088825-12-000048","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23","frame":"CY2009"},{"start":"2009-02-01","end":"2010-01-31","val":90000,"accn":"0001088825-11-000032","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-14"},{"start":"2010-02-01","end":"2010-04-30","val":19000,"accn":"0001088825-11-000073","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-06-06","frame":"CY2010Q1"},{"start":"2010-02-01","end":"2010-07-31","val":65000,"accn":"0001088825-11-000109","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-09-09"},{"start":"2010-02-01","end":"2010-10-31","val":93000,"accn":"0001088825-11-000132","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-12-08"},{"start":"2010-02-01","end":"2010-10-31","val":93000,"accn":"0001088825-10-000115","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-12-07"},{"start":"2010-02-01","end":"2011-01-31","val":96000,"accn":"0001088825-13-000028","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2010"},{"start":"2010-02-01","end":"2011-01-31","val":96000,"accn":"0001088825-12-000048","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23"},{"start":"2010-02-01","end":"2011-01-31","val":96000,"accn":"0001088825-11-000032","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-14"},{"start":"2011-02-01","end":"2011-04-30","val":0,"accn":"0001088825-11-000073","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-06-06","frame":"CY2011Q1"},{"start":"2011-02-01","end":"2011-07-31","val":619000,"accn":"0001088825-12-000098","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-31"},{"start":"2011-02-01","end":"2011-07-31","val":619000,"accn":"0001088825-11-000109","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-09-09"},{"start":"2011-02-01","end":"2011-10-31","val":619000,"accn":"0001088825-12-000131","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-30"},{"start":"2011-02-01","end":"2011-10-31","val":619000,"accn":"0001088825-11-000132","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-12-08"},{"start":"2011-02-01","end":"2012-01-31","val":619000,"accn":"0001088825-14-000019","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2011"},{"start":"2011-02-01","end":"2012-01-31","val":619000,"accn":"0001088825-13-000028","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"start":"2011-02-01","end":"2012-01-31","val":619000,"accn":"0001088825-12-000048","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23"},{"start":"2012-02-01","end":"2012-07-31","val":0,"accn":"0001088825-12-000098","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-31"},{"start":"2012-02-01","end":"2012-10-31","val":0,"accn":"0001088825-12-000131","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-30"},{"start":"2012-02-01","end":"2013-01-31","val":0,"accn":"0001088825-14-000019","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2012"},{"start":"2012-02-01","end":"2013-01-31","val":0,"accn":"0001088825-13-000028","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"start":"2013-02-01","end":"2014-01-31","val":0,"accn":"0001088825-14-000019","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013"}]}},"AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther":{"label":"Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities, Other (Deprecated 2011-01-31)","description":"Transactions that do not result in cash inflows or outflows in the period in which they occur, but affect net income and thus are removed when calculating net cash flow from operating activities using the indirect cash flow method. 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Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as 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A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related 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.","units":{"USD":[{"end":"2011-01-31","val":25607000,"accn":"0001088825-11-000132","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-12-08","frame":"CY2010Q4I"},{"end":"2011-01-31","val":25607000,"accn":"0001088825-11-000109","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-09-09"},{"end":"2011-07-31","val":59763000,"accn":"0001088825-11-000109","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-09-09","frame":"CY2011Q2I"},{"end":"2011-10-31","val":56245000,"accn":"0001088825-11-000132","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-12-08","frame":"CY2011Q3I"}]}},"CommercialPaperAtCarryingValue":{"label":"Commercial Paper, at Carrying Value","description":"Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant 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.","units":{"USD":[{"end":"2011-01-31","val":40189000,"accn":"0001088825-11-000132","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-12-08","frame":"CY2010Q4I"},{"end":"2011-01-31","val":40189000,"accn":"0001088825-11-000109","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-09-09"},{"end":"2011-07-31","val":57939000,"accn":"0001088825-11-000109","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-09-09","frame":"CY2011Q2I"},{"end":"2011-10-31","val":51583000,"accn":"0001088825-11-000132","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-12-08","frame":"CY2011Q3I"}]}},"CommonStockParOrStatedValuePerShare":{"label":"Common Stock, Par or Stated Value Per Share","description":"Face amount or stated value per share of common 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This item includes treasury stock repurchased by the entity. 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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":"2013-01-31","val":592000,"accn":"0001088825-13-000028","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q4I"},{"end":"2014-01-31","val":81000,"accn":"0001088825-14-000019","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2015-01-31","val":15261000,"accn":"0001088825-15-000043","fy":2015,"fp":"FY","form":"10-K","filed":"2015-03-19","frame":"CY2014Q4I"},{"end":"2016-01-31","val":13791000,"accn":"0001088825-16-000243","fy":2016,"fp":"FY","form":"10-K","filed":"2016-03-23","frame":"CY2015Q4I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year One","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized 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":"2013-01-31","val":4464000,"accn":"0001088825-13-000028","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q4I"},{"end":"2014-01-31","val":2196000,"accn":"0001088825-14-000019","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2015-01-31","val":8301000,"accn":"0001088825-15-000043","fy":2015,"fp":"FY","form":"10-K","filed":"2015-03-19","frame":"CY2014Q4I"},{"end":"2016-01-31","val":11271000,"accn":"0001088825-16-000243","fy":2016,"fp":"FY","form":"10-K","filed":"2016-03-23","frame":"CY2015Q4I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseYearFive":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year Five","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized 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":"2013-01-31","val":1758000,"accn":"0001088825-13-000028","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q4I"},{"end":"2014-01-31","val":162000,"accn":"0001088825-14-000019","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2015-01-31","val":6365000,"accn":"0001088825-15-000043","fy":2015,"fp":"FY","form":"10-K","filed":"2015-03-19","frame":"CY2014Q4I"},{"end":"2016-01-31","val":5243000,"accn":"0001088825-16-000243","fy":2016,"fp":"FY","form":"10-K","filed":"2016-03-23","frame":"CY2015Q4I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseYearFour":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year Four","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. 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orm":"10-Q","filed":"2016-08-29"},{"start":"2016-05-01","end":"2016-07-31","val":-6000,"accn":"0001088825-16-000393","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-29","frame":"CY2016Q2"}]}},"OtherInvestments":{"label":"Other Investments","description":"Amount of investments classified as 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