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Common Stock Repurchase Program Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Apr. 30, 2017 USD ($) $ / shares shares
Common Stock |
Equity, Class of Treasury Stock [Line Items] |
Repurchased shares of its common stock on the open market, value | $ | $ 61.2
Retained Earnings |
Equity, Class of Treasury Stock [Line Items] |
Repurchased shares of its common stock on the open market, value | $ | $ 130.8
Common Stock Repurchase Program |
Equity, Class of Treasury Stock [Line Items] |
Common stock repurchased and retired (in shares) | shares | 2.2
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share) | $ / shares | $ 85.48
Common Stock shares remained available for repurchase under repurchase plans (in shares) | shares | 24.4

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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