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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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Stock-Based Compensation.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Net number of share options (or share units) granted during the period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2011	Aug. 31, 2011 Employee Stock Option [Member]	Aug. 31, 2010 Employee Stock Option [Member]	Aug. 31, 2011 Employee Stock Option [Member]	Aug. 31, 2010 Employee Stock Option [Member]	Aug. 31, 2011 Other Stock-Based Awards [Member]	Aug. 31, 2010 Other Stock-Based Awards [Member]	Aug. 31, 2011 Other Stock-Based Awards [Member]	Aug. 31, 2010 Other Stock-Based Awards [Member]	Apr. 07, 2011 2010 Equity Incentive Plan [Member]
Stock-Based Compensation (Additional) (Textuals)
Intrinsic value of stock options outstanding	$ 0
Intrinsic value of stock options exercisable	0
Stock options granted, total	20,000
Stock-based compensation expense associated with stock options, total		1.5	1.4	4.2	4.3			0.9
Recognized compensation income, from other stock-based awards						0.5	5.3		1.0
Increase in number of shares 2010 equity incentive plan										4,000,000
Stock options outstanding and stock options exercisable
Options outstanding at beginning of period, Options	8,798,613
Options outstanding at beginning of period, Weighted Average Exercise Price	$ 24.19
Granted, Options	20,000
Granted, Weighted Average Exercise Price	$ 9.54
Exercised, Options
Exercised, Weighted Average Exercise Price
Cancelled, Options	(275,363)
Cancelled, Weighted Average Exercise Price	$ 21.44
Options outstanding at end of period, Options	8,543,250
Options outstanding at end of period, Weighted Average Exercise Price	$ 24.24
Options exercisable at end of period, Options	6,123,062
Options exercisable at end of period, Weighted Average Exercise Price	$ 28.46
Stock Based Compensation (Textuals) [Abstract]
Weighted average remaining contractual life of stock options outstanding	7.1
Weighted average remaining contractual life of stock options exercisable	P6.5Y
Unrecognized compensation cost, total	$ 3.3