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Earnings Per Share and Stock Issuances-Common Stock Activity (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Stock Options And Restricted Stock Units [Member]
Employee Stock Purchase Plan [Line Items]
Shares issued under stock option, employee stock purchase plans and RSUs	0.4	0.4	1.4	1.5
Share Repurchase Program [Member]
Employee Stock Purchase Plan [Line Items]
Stock Repurchased During Period, Shares	0.5	0	1.8	1.9

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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