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Common Stock Repurchases	9 Months Ended
Common Stock Repurchases	Aug. 31, 2014
Common Stock Repurchases [Abstract]
Common Stock Repurchases	Common Stock Repurchases We repurchased and retired 2.3 million shares of our common stock for $52.6 million in the nine months ended August 31, 2014. The shares were repurchased as part of our Board of Directors authorized $100.0 million share repurchase program. In the nine months ended August 31, 2013, we repurchased 10.3 million shares of our common stock for $237.4 million as part of our Board of Directors previously authorized $360.0 million share repurchase program.