This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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Value of stock issued as a result of the exercise of stock options.

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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended					9 Months Ended								9 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013 Common Stock	Aug. 31, 2012 Common Stock	Nov. 30, 2011 Common Stock	Aug. 31, 2013 Paid-in Capital	Aug. 31, 2012 Paid-in Capital	Aug. 31, 2013 Retained Earnings	Aug. 31, 2012 Retained Earnings	Aug. 31, 2013 Accumulated Other Comprehensive Income	Nov. 30, 2012 Accumulated Other Comprehensive Income	Aug. 31, 2012 Accumulated Other Comprehensive Income	Nov. 30, 2011 Accumulated Other Comprehensive Income	Aug. 31, 2013 Trust for Benefit of Employees [Member]	Aug. 31, 2012 Trust for Benefit of Employees [Member]	Aug. 31, 2013 Treasury Stock	Aug. 31, 2012 Treasury Stock	Nov. 30, 2011 Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 376,806	$ 442,657	$ 115,178	$ 115,171	$ 115,171	$ 888,579	$ 884,190	$ 450,292	$ 519,844	$ (27,958)	$ (27,958)	$ (26,152)	$ (26,152)	$ (115,149)	$ (118,059)	$ (934,136)	$ (932,337)	$ (932,337)
Net income (loss)	27,278	3,261	11,847	(66,677)						11,847	(66,677)
Dividends on common stock			(6,272)	(8,674)						(6,272)	(8,674)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			1,558		115			1,443
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options			8,346					412										7,934
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			0					(325)								325
Restricted stock amortization			2,382	1,232				2,382	1,232
Stock-based compensation			1,214	3,452				1,214	3,452
Issuance of common stock			109,503					(106,622)										216,125
Grantor stock ownership trust			589	451				305	(173)							284	624
Treasury Stock, Value, Acquired, Cost Method			(7,967)															(7,967)
Ending balance	$ 498,006	$ 372,441	$ 498,006	$ 372,441	$ 115,293	$ 115,171	$ 115,171	$ 787,388	$ 888,701	$ 455,867	$ 444,493	$ (27,958)	$ (27,958)	$ (26,152)	$ (26,152)	$ (114,540)	$ (117,435)	$ (718,044)	$ (932,337)	$ (932,337)