Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended										6 Months Ended		12 Months Ended			54 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Oct. 31, 2012	Oct. 31, 2011	Apr. 30, 2012	Apr. 30, 2010	Apr. 30, 2009	Oct. 31, 2012
Commitments And Contingencies [Line Items]
Accounts payable, accrued expenses and other current liabilities	$ 406,447,000		$ 567,079,000								$ 406,447,000		$ 567,079,000			$ 406,447,000
Other noncurrent liabilities	365,970,000		388,132,000								365,970,000		388,132,000			365,970,000
Revolving line of credit obligation	90,400,000										90,400,000					90,400,000
Remaing obligation commitment	39,100,000										39,100,000					39,100,000
Compensating balance	75,000,000										75,000,000					75,000,000
Percentage of fraud on originated loans											68.00%
Claims received for loans	10,000,000	142,000,000	543,000,000	35,000,000	483,000,000	31,000,000	55,000,000	33,000,000	21,000,000	109,000,000	152,000,000		1,100,000,000	145,000,000	432,000,000	2,039,000,000
Percentage of reviewed claims denied											93.00%
Loss on representation and warranty obligations																78,000,000
Loss on other settlements																56,000,000
Loss severity rate											62.00%
Mortgage loans held for sale, net balance	7,300,000										7,300,000					7,300,000
Claims subject to review by SCC, amount	28,000,000										28,000,000					28,000,000
Reassertion of previously denied claims	16,000,000										16,000,000					16,000,000
Reserve for losses on repurchases	129,265,000		130,018,000		142,923,000		126,260,000				129,265,000	142,923,000	130,018,000			129,265,000
Net recorded loss provision												20,000,000
Loss severity rate, assumed	1.00%										1.00%					1.00%
Denial rate, assumed	1.00%										1.00%					1.00%
Increase in losses due to assumed 1% increase in loss severities and 1% decrease is denial rates											27,000,000
Private-Label Securitization Transactions [Member]
Commitments And Contingencies [Line Items]
Claims received for loans											136,000,000
Monoline Insurers [Member]
Commitments And Contingencies [Line Items]
Claims received for loans											14,000,000
Fannie Mae [Member]
Commitments And Contingencies [Line Items]
Claims received for loans											2,000,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Number of days to respond to representation and warranty claims, in days											60 days
Maximum [Member]
Commitments And Contingencies [Line Items]
Number of days to respond to representation and warranty claims, in days											120 days
Standard Guarantee [Member]
Commitments And Contingencies [Line Items]
Accounts payable, accrued expenses and other current liabilities	14,700,000		16,300,000								14,700,000		16,300,000			14,700,000
Contingent Payments [Member]
Commitments And Contingencies [Line Items]
Other noncurrent liabilities	10,300,000		6,800,000								10,300,000		6,800,000			10,300,000
Loans Originated In 2006 And 2007 [Member]
Commitments And Contingencies [Line Items]
Percentage of loans originated											95.00%
Loans Originated From 2005 To 2007 [Member]
Commitments And Contingencies [Line Items]
Amount of loans originated	84,000,000,000										84,000,000,000					84,000,000,000
Loans Originated From 2005 To 2007 [Member] | Government-Sponsored Entity [Member]
Commitments And Contingencies [Line Items]
Percentage of loans originated											1.00%
Loans Originated In 2005 [Member]
Commitments And Contingencies [Line Items]
Value of defaulted loans	3,900,000,000										3,900,000,000					3,900,000,000
Loans Originated In 2006 [Member]
Commitments And Contingencies [Line Items]
Value of defaulted loans	6,100,000,000										6,100,000,000					6,100,000,000
Loans Originated In 2007 [Member]
Commitments And Contingencies [Line Items]
Value of defaulted loans	$ 2,700,000,000										$ 2,700,000,000					$ 2,700,000,000
Loans Paid In Full, Repurchased, Or Sold Without Recourse [Member]
Commitments And Contingencies [Line Items]
Percentage of reviewed claims denied											1.00%
Loans Liquidated [Member]
Commitments And Contingencies [Line Items]
Percentage of reviewed claims denied											1.00%