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Business and Summary of Significant Accounting Policies - Stock Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases | $ 221.8 | $ 197.2 | $ 165.6
Tax benefit | (2.6) | (1.6) | (45.2)
Stock-based compensation expense related to stock awards and ESPP purchases, net | 219.2 | 195.6 | 120.4
Cost of subscription |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases | 7.0 | 5.7 | 4.3
Cost of license and other revenue |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases | 7.1 | 6.1 | 4.6
Marketing and sales |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases | 94.1 | 85.2 | 72.4
Research and development |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases | 81.3 | 70.4 | 56.0
General and administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases | $ 32.3 | $ 29.8 | $ 28.3

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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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