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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, 2016 USD ($) $ / shares shares | Jul. 31, 2016 USD ($) $ / shares shares
Common Stock |  |
Equity, Class of Treasury Stock [Line Items] |  |
Repurchased shares of its common stock on the open market, value | $ | $ 65.8 | $ 111.5
Retained Earnings |  |
Equity, Class of Treasury Stock [Line Items] |  |
Repurchased shares of its common stock on the open market, value | $ | $ 104.1 | $ 158.5
Common Stock Repurchase Program |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common stock repurchased and retired (in shares) | shares | 3.0 | 4.8
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share) | $ / shares | $ 55.88 | $ 56.20
Common Stock shares remained available for repurchase under repurchase plans (in shares) | shares | 1.5 | 1.5

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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