Loss Contingencies Arising From Representations And Warranties of Our Discontinued Mortgage Operations (Details) (USD $)	6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Apr. 30, 2014	Apr. 30, 2013
Loss Contingency Accrual [Roll Forward]
Provisions	$ 10,300,000	$ 20,600,000	$ 23,700,000
SCC [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross	193,765,000	158,765,000	183,765,000	158,765,000
Loss Contingency Accrual [Roll Forward]
Payments	0	0
Balance, end of the period	$ 10,000,000	$ 0