Loss Contingencies Arising From Representations And Warranties of Our Discontinued Mortgage Operations Loss Contingencies Arising From Representations And Warranties of Our Discontinued Mortgage Operations (Contingency Rollforward) (Details) (SCC [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
SCC [Member]
Loss Contingency Accrual [Roll Forward]
Balance, beginning of the year	$ 130,018	$ 126,260	$ 188,200
Provisions	40,000	20,000	0
Payments	(11,253)	(16,242)	(61,940)
Balance, end of the year	$ 158,765	$ 130,018	$ 126,260