Segment Information (Continuing Operations By Reportable Operating Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Segment Reporting Information [Line Items]
REVENUES									$ 2,905,943	$ 2,893,771	$ 2,944,980
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES	1,129,836	(96,268)	(162,288)	(169,269)	981,626	(1,026)	(203,929)	(200,601)	702,011	576,070	627,703
IDENTIFIABLE ASSETS	4,537,779				4,649,567				4,537,779	4,649,567	5,289,453
Asset held for sale											900,328
Tax Services
Segment Reporting Information [Line Items]
REVENUES									2,877,967	2,862,378	2,912,361
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES									821,143	704,002	767,498
IDENTIFIABLE ASSETS	3,012,525				2,298,484				3,012,525	2,298,484	2,267,236
Corporate And Eliminations
Segment Reporting Information [Line Items]
REVENUES									27,976	31,393	32,619
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES									(119,132)	(127,932)	(139,795)
Corporate
Segment Reporting Information [Line Items]
IDENTIFIABLE ASSETS	$ 1,525,254				$ 2,351,083				$ 1,525,254	$ 2,351,083	$ 2,121,889