Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Grantor Stock Ownership Trust	Treasury Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance, Shares at Nov. 30, 2012		(115,178,000)	(10,616,000)	(27,340,000)
Balance at Nov. 30, 2012	$ 376,806	$ 115,178	$ (115,149)	$ (934,136)	$ 888,579	$ 450,292	$ (27,958)
Net income (loss)	39,963					39,963
Other comprehensive income (loss), net of tax	10,442						10,442
Dividends on common stock	$ (8,366)					(8,366)
Employee stock options/other, Shares	(118,208)	(118,000)
Employee stock options/other, Value	$ 1,592	$ 118			1,474
Conversion of liability awards to equity awards, Shares				478,000
Conversion of liability awards to equity awards, Value	8,346			$ 7,934	412
Restricted stock awards, Shares			88,000
Restricted stock awards, Value	0		$ 954		(954)
Stock-based compensation	5,699				5,699
Issuance of common stock, Shares				6,325,000
Issuance of common stock, Value	109,503			$ 216,125	(106,622)
Grantor stock ownership trust, Shares			26,000
Grantor stock ownership trust, Value	589		$ 284		305
Treasury stock, Shares				(513,000)
Treasury stock, Value	(8,488)			$ (8,488)
Ending Balance, Shares at Nov. 30, 2013		(115,296,000)	(10,502,000)	(21,050,000)
Balance at Nov. 30, 2013	536,086	$ 115,296	$ (113,911)	$ (718,565)	788,893	481,889	(17,516)
Net income (loss)	918,349					918,349
Other comprehensive income (loss), net of tax	(3,492)						(3,492)
Dividends on common stock	$ (8,982)					(8,982)
Employee stock options/other, Shares	(36,665)	(37,000)
Employee stock options/other, Value	$ 1,896	$ 37			1,859
Conversion of liability awards to equity awards, Value	6,455				6,455
Restricted stock awards, Shares		54,000	166,000
Restricted stock awards, Value	0	$ 54	$ 1,805		(1,859)
Stock-based compensation	9,099				9,099
Issuance of common stock, Shares				7,986,000
Issuance of common stock, Value	137,045			$ 272,635	(135,590)
Treasury stock, Shares				(33,000)
Treasury stock, Value	(546)			$ (546)
Ending Balance, Shares at Nov. 30, 2014		(115,387,000)	(10,336,000)	(13,097,000)
Balance at Nov. 30, 2014	1,595,910	$ 115,387	$ (112,106)	$ (446,476)	668,857	1,391,256	(21,008)
Net income (loss)	84,643					84,643
Other comprehensive income (loss), net of tax	3,689						3,689
Dividends on common stock	$ (9,186)					(9,186)
Employee stock options/other, Shares	(76,164)	(76,000)
Employee stock options/other, Value	$ (798)	$ 76			(874)
Restricted stock awards, Shares		85,000	200,000
Restricted stock awards, Value	0	$ 85	$ 2,170		(2,255)
Stock-based compensation	17,143				17,143
Treasury stock, Shares				(40,000)
Treasury stock, Value	(567)			$ (567)
Ending Balance, Shares at Nov. 30, 2015		(115,548,000)	(10,136,000)	(13,137,000)
Balance at Nov. 30, 2015	$ 1,690,834	$ 115,548	$ (109,936)	$ (447,043)	$ 682,871	$ 1,466,713	$ (17,319)