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Stock-based Compensation Expense Additional Information (Details) $ / shares in Units, $ in Millions | 3 Months Ended
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Apr. 30, 2017 USD ($) period $ / shares shares | Apr. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Market capitalization | $ 2,000.0 |
Restricted Stock Units (RSUs) and Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards vested in period, fair value | $ 76.9 | $ 49.1
Awards granted in period | shares | 622,500 |
Restricted Stock Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted in period | shares | 400,000 |
Allocated share-based compensation expense | $ 50.0 | 38.8
Acceleration of eligible stock awards | $ 3.2 |
Performance Stock Unit |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted in period | shares | 200,000 |
Allocated share-based compensation expense | $ 10.9 | $ 6.3
Acceleration of eligible stock awards | $ 4.6 |
Award vesting period | 3 years |
Employee Qualified Stock Purchase Plan 1998 ESP Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee stock purchase plan maximum percentage of compensation to purchase shares by eligible participants | 15.00% |
Employee stock purchase plan minimum percentage of common stock fair value defined to purchase shares by eligible participants | 85.00% |
Employee stock purchase plan, number of exercise periods | period | 4 |
Employee stock purchase plan, term of exercise period | 6 months |
Employee stock purchase plan, term of offering period | 24 months |
Shares issued under employee stock purchase plans (shares) | shares | 1,100,000 | 1,200,000
Awards issued, share average price (in usd per share) | $ / shares | $ 38.34 | $ 36.67
Weighted average grant date fair value per share of stock options granted (in dollars per share) | $ / shares | $ 25.13 | $ 17.88
Share-based Compensation Award, Tranche One | Performance Stock Unit |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
PSU Annual Vesting Percentage | 33.33% |
Share-based Compensation Award, Tranche Two | Performance Stock Unit |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
PSU Annual Vesting Percentage | 33.33% |
Share-based Compensation Award, Tranche Three | Performance Stock Unit |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
PSU Annual Vesting Percentage | 33.33% |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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