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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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Cash and Investments, Current","description":"The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. 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Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.","units":{"USD":[{"end":"2017-01-31","val":0,"accn":"0001628280-18-004266","fy":2018,"fp":"FY","form":"10-K","filed":"2018-04-13","frame":"CY2016Q4I"},{"end":"2018-01-31","val":413000,"accn":"0001628280-18-004266","fy":2018,"fp":"FY","form":"10-K","filed":"2018-04-13"},{"end":"2018-01-31","val":413000,"accn":"0001628280-19-003963","fy":2019,"fp":"FY","form":"10-K","filed":"2019-04-05","frame":"CY2017Q4I"},{"end":"2019-01-31","val":0,"accn":"0001628280-19-003963","fy":2019,"fp":"FY","form":"10-K","filed":"2019-04-05","frame":"CY2018Q4I"}]}},"RetainedEarningsAccumulatedDeficit":{"label":"Retained Earnings (Accumulated Deficit)","description":"The cumulative amount of the 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