Segment Information (Continuing Operations By Reportable Operating Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Segment Reporting Information [Line Items]
Total revenues	$ 2,562,990	$ 199,770	$ 134,340	$ 127,195	$ 2,200,212	$ 471,979	$ 137,263	$ 96,489	$ 3,024,295	$ 2,905,943	$ 2,893,771
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES	1,478,797	(347,825)	(179,362)	(184,494)	1,129,836	(96,268)	(162,288)	(169,269)	767,116	702,011	576,070
IDENTIFIABLE ASSETS	4,693,529				4,537,779				4,693,529	4,537,779	4,649,567
Tax Services
Segment Reporting Information [Line Items]
Total revenues									2,999,460	2,877,967	2,862,378
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES									866,367	821,143	704,002
IDENTIFIABLE ASSETS	2,945,242				3,012,525				2,945,242	3,012,525	2,298,484
Corporate And Eliminations
Segment Reporting Information [Line Items]
Total revenues									24,835	27,976	31,393
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES									(99,251)	(119,132)	(127,932)
Corporate
Segment Reporting Information [Line Items]
IDENTIFIABLE ASSETS	$ 1,748,287				$ 1,525,254				$ 1,748,287	$ 1,525,254	$ 2,351,083