Discontinued Operations (Income (Loss) From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Revenues	$ 50,508	$ 171,071	$ 416,436	$ 549,180
Pretax income (loss) from operations	(26,268)	(2,224)	(35,188)	(1,897)
Income taxes (benefit)	(6,462)	(537)	(10,268)	268
Net income (loss) from operations	(19,806)	(1,687)	(24,920)	(2,165)
Pretax loss on sales of businesses	(236)		(109,485)
Income tax benefit	(20,260)		(59,969)
Net gain (loss) on sales of businesses	20,024		(49,519)
Net income (loss) from discontinued operations	218	(1,687)	(74,436)	(2,165)
RSM And Related Businesses [Member]
Pretax income (loss) from operations	1,117	8,327	18,831	15,228
Mortgage [Member]
Pretax income (loss) from operations	$ (27,385)	$ (10,551)	$ (54,019)	$ (17,125)