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) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Loss Contingencies [Line Items]
Document Fiscal Year Focus	2016
SCC
Loss Contingency Accrual [Roll Forward]
Balance, beginning of the year		$ 149,765	$ 183,765	$ 158,765
Loss provisions		4,000	16,000	25,000
Payments		$ (88,500)	(50,000)	0
Balance, end of the year	$ 65,265		$ 149,765	$ 183,765