Segment Information (Continuing Operations By Reportable Operating Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Segment Reporting Information [Line Items]
REVENUES									$ 2,893,771	$ 2,944,980	$ 3,014,835
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES	981,626	(1,026)	(203,929)	(200,601)	1,044,338	(25,968)	(183,516)	(207,151)	576,070	627,703	723,414
IDENTIFIABLE ASSETS	4,649,567				5,289,453				4,649,567	5,289,453	5,271,712
Asset held for sale					900,328					900,328	853,217
Tax Services [Member]
Segment Reporting Information [Line Items]
REVENUES									2,862,378	2,912,361	2,975,252
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES									704,002	767,498	867,362
IDENTIFIABLE ASSETS	2,298,484				2,267,236				2,298,484	2,267,236	2,279,161
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
REVENUES									31,393	32,619	39,583
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES									(127,932)	(139,795)	(143,948)
Corporate [Member]
Segment Reporting Information [Line Items]
IDENTIFIABLE ASSETS	$ 2,351,083				$ 2,121,889				$ 2,351,083	$ 2,121,889	$ 2,139,334