Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016	Dec. 01, 2018
Accounting Policies [Abstract]
Cash equivalents	$ 385,200	$ 481,100
Schedule of Equity Method Investments [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	1,000
Impairment of Real Estate	26,104	20,605	$ 49,580
Property and equipment amount	24,283	19,521
Accumulated depreciation	20,100	19,000
Depreciation expense	2,530	2,791	3,637
Advertising costs incurred	37,300	34,400	32,700
Expensed legal fees	$ 12,400	$ 14,000	$ 13,600
Minimum
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment	2 years
Maximum
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment	10 years
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member]
Schedule of Equity Method Investments [Line Items]
Retained earnings				$ 12,000