Discontinued Operations (Income (Loss) From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		$ 50,508		$ 416,436
Pretax income (loss) from operations	(1,276)	(26,268)	(10,843)	(35,188)
Income tax benefit	(483)	(6,462)	(4,215)	(10,268)
Net loss from operations	(793)	(19,806)	(6,628)	(24,920)
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		(49,516)
Net income (loss) from discontinued operations	(793)	218	(6,628)	(74,436)
RSM And Related Businesses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax income (loss) from operations	(511)	1,117	(204)	18,831
Mortgage [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax income (loss) from operations	$ (765)	$ (27,385)	$ (10,639)	$ (54,019)