Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Class A Common Stock Common Stock	Class B Common Stock Common Stock
Beginning Balance at Nov. 30, 2011	$ 1,212,466	$ 445,005	$ 772,938	$ (5,941)	$ 264	$ 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,578		54,578
Other comprehensive income	645			645
Cash dividends ($.20 per share for 2012, $.22 per share for 2013 and $.24 per share for 2014)	(9,283)		(9,283)
Reacquisition of previously issued common stock	(10,556)	(3,491)	(7,061)		(4)
Other	(914)	(914)
Stock-based compensation	1,874	1,874
Ending Balance at Nov. 30, 2012	1,248,810	442,474	811,172	(5,296)	260	200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,292		45,292
Other comprehensive income	658			658
Exercise of stock options	341	340			1
Cash dividends ($.20 per share for 2012, $.22 per share for 2013 and $.24 per share for 2014)	(10,229)		(10,229)
Reacquisition of previously issued common stock	(259)	(259)	0		0
Other	9	9
Stock-based compensation	2,533	2,533
Ending Balance at Nov. 30, 2013	1,287,155	445,097	846,235	(4,638)	261	200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	67,379		67,379
Other comprehensive income	657			657
Cash dividends ($.20 per share for 2012, $.22 per share for 2013 and $.24 per share for 2014)	(11,181)		(11,181)
Reacquisition of previously issued common stock	(323)	(323)	0		0
Other	(81)	(82)			1
Stock-based compensation	2,826	2,826
Ending Balance at Nov. 30, 2014	$ 1,346,432	$ 447,518	$ 902,433	$ (3,981)	$ 262	$ 200