Employee Benefit and Stock Plans (Tables)

12 Months Ended

Nov. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock option transactions

Stock option transactions are summarized as follows:

	Years Ended November 30,
	2012				2011				2010
	Options		Weighted Average Exercise Price		Options		Weighted Average Exercise Price		Options		Weighted Average Exercise Price
Options outstanding at beginning of year	10,160,396		$	21.27	8,798,613		$	24.19	5,711,701		$	27.39
Granted	30,000		9.08		1,716,000		6.36		3,572,237		18.71
Exercised	(7,494	)	13.93		—		—		(28,281	)	13.00
Cancelled	(77,356	)	17.96		(354,217	)	21.47		(457,044	)	22.05
Options outstanding at end of year	10,105,546		$	21.27	10,160,396		$	21.27	8,798,613		$	24.19
Options exercisable at end of year	8,533,224		$	23.76	7,142,568		$	26.43	6,146,605		$	28.73
Options available for grant at end of year	1,721,847				2,477,219				21,703

Stock options outstanding and stock options exercisable

Stock options outstanding and stock options exercisable at November 30, 2012 are as follows:

	Options Outstanding				Options Exercisable
Range of Exercise Price	Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life
$  6.32 to $10.54	1,704,998	$	6.43	8.8	567,674	$	6.44
$10.55 to $14.96	2,030,550	12.07		6.6	1,595,552	12.34
$14.97 to $20.08	2,211,772	17.69		6.3	2,211,772	17.69
$20.09 to $33.92	2,024,721	27.35		5.1	2,024,721	27.35
$33.93 to $69.63	2,133,505	39.81		5.4	2,133,505	39.81
$  6.32 to $69.63	10,105,546	$	21.27	6.3	8,533,224	$	23.76	5.9

Assumptions of Black-Scholes option-pricing model

The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions:

	Years Ended November 30,
	2012		2011		2010
Risk-free interest rate	.7	%	.9	%	.7	%
Expected volatility factor	65.6	%	65.6	%	61.7	%
Expected dividend yield	1.9	%	3.9	%	2.2	%
Expected term	5 years		5 years		3 years

Restricted stock transactions

Restricted stock transactions are summarized as follows:

	Years Ended November 30,
	2012				2011
	Shares		Weighted Average per Share Grant Date Fair Value		Shares		Weighted Average per Share Grant Date Fair Value
Outstanding at beginning of year	338,912		$	15.03	402,477		$	15.09
Granted	207,617		16.23		—		—
Vested	(176,135	)	14.25		(10,930	)	13.49
Cancelled	(140,670	)	15.44		(52,635	)	15.44
Outstanding at end of year	229,724		$	15.81	338,912		$	15.03