Loss Contingencies Arising From Representations and Warranties of Our Discontinued Mortgage Operations (Narrative) (Details) (USD $)	3 Months Ended	36 Months Ended	60 Months Ended			12 Months Ended
	Jul. 31, 2014	Apr. 30, 2007	Apr. 30, 2013	Apr. 30, 2014	Jul. 31, 2013	Apr. 30, 2014 SCC [Member]	Apr. 30, 2013 SCC [Member]	Apr. 30, 2012 SCC [Member]	Jul. 31, 2014 SCC [Member]	Jul. 31, 2013 SCC [Member]
Loss Contingencies [Line Items]
Percentage of fraud on originated loans		68.00%
Claims received for loans	$ 3,300,000		$ 2,100,000,000			$ 70,300,000	$ 190,000,000	$ 1,100,000,000
Claims subject to review by SCC, amount	3,600,000
Loss Contingency Accrual, Product Liability, Gross						183,765,000	158,765,000		193,765,000	158,765,000
Loss Contingency Accrual	23,700,000			23,700,000	12,500,000
Principal Assets of SCC	$ 515,000,000