Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Income Taxes [Abstract]
Gross unrecognized tax benefits balance at beginning of year	$ 35,782	$ 38,516
Increases for tax positions of current fiscal year	8,449	1,267
Increases for tax positions of prior fiscal years	964	413
Decreases for tax positions of prior fiscal years	(2)	(493)
Lapse of statutes of limitation	(1,574)	(3,921)
Gross unrecognized tax benefits balance at end of year	43,619	35,782
Interest and penalties	761	872
Total gross unrecognized tax benefits balance at end of year	$ 44,380	$ 36,654