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Excludes cash and cash equivalents within disposal group and discontinued operation.","units":{"USD":[{"end":"2012-04-30","val":31800000,"accn":"0000794619-13-000024","fy":2013,"fp":"FY","form":"10-K","filed":"2013-06-28","frame":"CY2012Q1I"},{"end":"2013-04-30","val":38900000,"accn":"0000794619-13-000024","fy":2013,"fp":"FY","form":"10-K","filed":"2013-06-28"},{"end":"2013-04-30","val":38900000,"accn":"0000794619-14-000016","fy":2014,"fp":"FY","form":"10-K","filed":"2014-06-30","frame":"CY2013Q1I"},{"end":"2014-04-30","val":38900000,"accn":"0000794619-14-000016","fy":2014,"fp":"FY","form":"10-K","filed":"2014-06-30"},{"end":"2014-04-30","val":38900000,"accn":"0000794619-15-000137","fy":2015,"fp":"FY","form":"10-K","filed":"2015-06-30","frame":"CY2014Q1I"},{"end":"2015-04-30","val":33000000,"accn":"0000794619-15-000137","fy":2015,"fp":"FY","form":"10-K","filed":"2015-06-30"},{"end":"2015-04-30","val":33000000,"accn":"0000794619-16-000374","fy":2016,"fp":"FY","form":"10-K","filed":"2016-06-29","frame":"CY2015Q1I"},{"end":"2016-04-30","val":34000000,"accn":"0000794619-16-000374","fy":2016,"fp":"FY","form":"10-K","filed":"2016-06-29"},{"end":"2016-04-30","val":34000000,"accn":"0000794619-17-000087","fy":2017,"fp":"FY","form":"10-K","filed":"2017-06-29","frame":"CY2016Q1I"},{"end":"2017-04-30","val":50100000,"accn":"0000794619-17-000087","fy":2017,"fp":"FY","form":"10-K","filed":"2017-06-29"},{"end":"2017-04-30","val":50100000,"accn":"0000794619-18-000077","fy":2018,"fp":"FY","form":"10-K","filed":"2018-06-29","frame":"CY2017Q1I"}]}},"CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations":{"label":"Cash Provided by (Used in) Operating Activities, Discontinued Operations","description":"Amount of cash inflow (outflow) of operating activities of discontinued operations. 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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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This item includes treasury stock repurchased by the entity. 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eeds 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