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Common Stock Repurchases	3 Months Ended
Common Stock Repurchases	Feb. 28, 2018
Common Stock Repurchases [Abstract]
Common Stock Repurchases	Common Stock Repurchases We repurchased and retired 1.1 million shares of our common stock for $45.0 million in the three months ended February 28, 2018 and 0.6 million shares for $18.1 million in the three months ended February 28, 2017. The shares were repurchased in both periods as part of our Board of Directors authorized share repurchase program. In September 2017, our Board of Directors increased our total share repurchase authorization to $250.0 million. As of February 28, 2018, there was $175.0 million remaining under this current authorization.