Loss Contingencies Arising From Representations And Warranties Of Our Discontinued Mortgage Operations (Rollforward Of Accrued Liability For Representation And Warranty Claims) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Loss Contingencies Arising From Representation And Warranties Of Our Discontinued Mortgage Operations [Abstract]
Reserve for representation and warranty claims, beginning of period	$ 130,018	$ 126,260
Provisions		20,000
Payments	(11,253)	(3,337)
Reserve for representation and warranty claims, end of period	$ 118,765	$ 142,923