Consolidated Statement of Shareholders' Equity (USD $) In Thousands	Total	Class A Common Stock $.01 Par Value	Class B Common Stock $.01 Par Value	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at beginning of period at Nov. 30, 2010	$ 1,187,177	$ 275	$ 203	$ 481,154	$ 712,099	$ (6,554)
Comprehensive income
Net income	42,958				42,958
Loss on currency translation, net of tax benefit of $8	12					12
Interest expense, net of tax benefit of $280	433					433
Total comprehensive income	43,403
Exercise of stock options	51			51
Cash dividends ($0.18 per share)	(8,585)				(8,585)
Reacquisition of previously issued common stock	(21,253)	(7)		(21,246)
Conversion of Class B Common Stock to Class A Common Stock		2	(2)
Income tax benefit related to stock-based compensation	(276)			(276)
Stock-based compensation	1,066			1,066
Balance at end of period at Aug. 31, 2011	$ 1,201,583	$ 270	$ 201	$ 460,749	$ 746,472	$ (6,109)