Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	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, 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 ($.22 per share for 2013, $.24 per share for 2014 and $.26 per share for 2015)	(10,229)		(10,229)
Reacquisition of previously issued common stock	(259)	(259)	0		0
Other	9	9
Stock-based compensation	2,533	2,533
Ending Balance at Nov. 30, 2013	1,287,155	445,097	846,235	(4,638)	261	200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	67,379		67,379
Other comprehensive income	657			657
Cash dividends ($.22 per share for 2013, $.24 per share for 2014 and $.26 per share for 2015)	(11,181)		(11,181)
Reacquisition of previously issued common stock	(323)	(323)	0		0
Other	(81)	(82)			1
Stock-based compensation	2,826	2,826
Ending Balance at Nov. 30, 2014	1,346,432	447,518	902,433	(3,981)	262	200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,634		56,634
Other comprehensive income	658			658
Cash dividends ($.22 per share for 2013, $.24 per share for 2014 and $.26 per share for 2015)	(12,127)		(12,127)
Reacquisition of previously issued common stock	(984)	(984)	0		0
Conversion of Class B Common Stock to Class A Common Stock	0				1	(1)
Other	(342)	(342)			0
Stock-based compensation	2,944	2,944
Ending Balance at Nov. 30, 2015	$ 1,393,215	$ 449,136	$ 946,940	$ (3,323)	$ 263	$ 199