Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2012 Minimum	Nov. 30, 2012 Maximum	Jun. 30, 2011 KBA Mortgage
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture						50.00%
Cash equivalents	$ 396,300,000	$ 212,800,000
Collateral for LOC facilities included in restricted cash	42,400,000	64,500,000
Estimated useful life for depreciation of property and equipment				2 years	10 years
Property and equipment amount	7,920,000	7,801,000
Accumulated depreciation	18,500,000	18,000,000
Depreciation expense	1,622,000	2,031,000	3,289,000
Advertising costs incurred	24,600,000	32,400,000	25,900,000
Expensed legal fees	$ 12,600,000	$ 16,900,000	$ 33,700,000