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Common Stock Repurchase Program (Additional Information) (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2018 USD ($) $ / shares shares | Jul. 31, 2018 USD ($) $ / shares shares
Equity, Class of Treasury Stock [Line Items] |  |
Common stock repurchased and retired (in shares) | shares | 1.1 | 1.3
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share) | $ / shares | $ 131.52 | $ 128.92
Common Stock |  |
Equity, Class of Treasury Stock [Line Items] |  |
Repurchased shares of its common stock on the open market, value | $ | $ 77.3 | $ 93.7
Retained Earnings |  |
Equity, Class of Treasury Stock [Line Items] |  |
Repurchased shares of its common stock on the open market, value | $ | $ 69.4 | $ 74.0
Common Stock Repurchase Program |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common stock shares remained available for repurchase under repurchase plans (in shares) | shares | 18.4 | 18.4

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