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An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. 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Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-02-29","val":10056000,"accn":"0001193125-12-194474","fy":2011,"fp":"FY","form":"10-K","filed":"2012-04-30","frame":"CY2012Q1I"},{"end":"2013-02-28","val":48736000,"accn":"0001193125-13-209085","fy":2012,"fp":"FY","form":"10-K","filed":"2013-05-09","frame":"CY2013Q1I"},{"end":"2014-02-28","val":66446000,"accn":"0001193125-14-222580","fy":2013,"fp":"FY","form":"10-K","filed":"2014-06-02","frame":"CY2014Q1I"},{"end":"2015-02-28","val":68840000,"accn":"0001193125-15-190304","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-15","frame":"CY2015Q1I"},{"end":"2016-02-29","val":61053000,"accn":"0001193125-16-604228","fy":2015,"fp":"FY","form":"10-K","filed":"2016-05-26","frame":"CY2016Q1I"}]}},"OperatingLeasesFutureMinimumPaymentsDueThereafter":{"label":"Operating Leases, Future Minimum Payments, Due Thereafter","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. 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Leases, Rent Expense, Sublease Rentals","description":"The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.","units":{"USD":[{"start":"2009-03-01","end":"2010-02-28","val":24891000,"accn":"0001193125-12-194474","fy":2011,"fp":"FY","form":"10-K","filed":"2012-04-30","frame":"CY2009"},{"start":"2010-03-01","end":"2011-02-28","val":16387000,"accn":"0001193125-13-209085","fy":2012,"fp":"FY","form":"10-K","filed":"2013-05-09","frame":"CY2010"},{"start":"2010-03-01","end":"2011-02-28","val":16387000,"accn":"0001193125-12-194474","fy":2011,"fp":"FY","form":"10-K","filed":"2012-04-30"},{"start":"2011-03-01","end":"2012-02-29","val":11332000,"accn":"0001193125-14-222580","fy":2013,"fp":"FY","form":"10-K","filed":"2014-06-02","frame":"CY2011"},{"start":"2011-03-01","end":"2012-02-29","val":11332000,"accn":"0001193125-13-209085","fy":2012,"fp":"FY","form":"10-K","filed":"2013-05-09"},{"start":"2011-03-01","end":"2012-02-29","val":11332000,"accn":"0001193125-12-194474","fy":2011,"fp":"FY","form":"10-K","filed":"2012-04-30"},{"start":"2012-03-01","end":"2013-02-28","val":7758000,"accn":"0001193125-15-190304","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-15","frame":"CY2012"},{"start":"2012-03-01","end":"2013-02-28","val":7758000,"accn":"0001193125-14-222580","fy":2013,"fp":"FY","form":"10-K","filed":"2014-06-02"},{"start":"2012-03-01","end":"2013-02-28","val":7758000,"accn":"0001193125-13-209085","fy":2012,"fp":"FY","form":"10-K","filed":"2013-05-09"},{"start":"2013-03-01","end":"2014-02-28","val":5152000,"accn":"0001193125-16-604228","fy":2015,"fp":"FY","form":"10-K","filed":"2016-05-26","frame":"CY2013"},{"start":"2013-03-01","end":"2014-02-28","val":5152000,"accn":"0001193125-15-190304","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-15"},{"start":"2013-03-01","end":"2014-02-28","val":5152000,"accn":"0001193125-14-222580","fy":2013,"fp":"FY","form":"10-K","filed":"2014-06-02"},{"start":"2014-03-01","end":"2015-02-28","val":2945000,"accn":"0001193125-16-604228","fy":2015,"fp":"FY","form":"10-K","filed":"2016-05-26","frame":"CY2014"},{"start":"2014-03-01","end":"2015-02-28","val":2945000,"accn":"0001193125-15-190304","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-15"},{"start":"2015-03-01","end":"2016-02-29","val":1742000,"accn":"0001193125-16-604228","fy":2015,"fp":"FY","form":"10-K","filed":"2016-05-26","frame":"CY2015"}]}},"OperatingLossCarryforwardsValuationAllowance":{"label":"Operating 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value.","units":{"USD":[{"start":"2014-03-01","end":"2015-02-28","val":4422000,"accn":"0001193125-16-604228","fy":2015,"fp":"FY","form":"10-K","filed":"2016-05-26","frame":"CY2014"},{"start":"2015-03-01","end":"2016-02-29","val":7657000,"accn":"0001193125-16-604228","fy":2015,"fp":"FY","form":"10-K","filed":"2016-05-26","frame":"CY2015"},{"start":"2015-11-28","end":"2016-02-29","val":8510000,"accn":"0001193125-16-604228","fy":2015,"fp":"FY","form":"10-K","filed":"2016-05-26","frame":"CY2016Q1"}]}},"OtherAssetsCurrent":{"label":"Other Assets, Current","description":"Amount of current assets classified as 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