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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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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-07-31","val":38008000,"accn":"0001193125-12-462631","fy":2012,"fp":"FY","form":"10-K/A","filed":"2012-11-09","frame":"CY2012Q2I"},{"end":"2013-07-31","val":28037000,"accn":"0001193125-13-418701","fy":2013,"fp":"FY","form":"10-K","filed":"2013-10-30","frame":"CY2013Q2I"},{"end":"2014-07-31","val":2087000,"accn":"0001193125-14-385305","fy":2014,"fp":"FY","form":"10-K","filed":"2014-10-28","frame":"CY2014Q2I"}]}},"PurchaseObligationDueInNextTwelveMonths":{"label":"Purchase Obligation, to be Paid, Year One","description":"Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. 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