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Business and Summary of Significant Accounting Policies - Change in Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maintenance |  |  |  |  |  |  |  |  | $ 989.6 | $ 1,103.1 | $ 1,152.5
Subscription |  |  |  |  |  |  |  |  | 894.3 | 443.1 | 228.1
License and other |  |  |  |  |  |  |  |  | 172.7 | 484.8 | 1,123.5
Total net revenue | $ 553.8 | $ 515.3 | $ 501.8 | $ 485.7 | $ 478.8 | $ 489.6 | $ 550.7 | $ 511.9 | 2,056.6 | 2,031.0 | 2,504.1
Maintenance and subscription |  |  |  |  |  |  |  |  | 214.4 | 191.7 | 162.3
License and other |  |  |  |  |  |  |  |  | 72.6 | 110.2 | 159.4
Amortization of developed technology |  |  |  |  |  |  |  |  | 16.4 | 40.0 | 49.0
Total cost of revenue |  |  |  |  |  |  |  |  | $ 303.4 | 341.9 | 370.7
Previously Reported |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subscription |  |  |  |  |  |  |  |  |  | 1,290.0 | 1,277.2
License and other |  |  |  |  |  |  |  |  |  | 741.0 | 1,226.9
Total net revenue |  |  |  |  |  |  |  |  |  | 2,031.0 | 2,504.1
Maintenance and subscription |  |  |  |  |  |  |  |  |  | 151.3 | 156.1
License and other |  |  |  |  |  |  |  |  |  | 190.6 | 214.6
Total cost of revenue |  |  |  |  |  |  |  |  |  | 341.9 | 370.7
Change in Presentation Reclassification |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maintenance |  |  |  |  |  |  |  |  |  | 1,103.1 | 1,152.5
Subscription |  |  |  |  |  |  |  |  |  | (846.9) | (1,049.1)
License and other |  |  |  |  |  |  |  |  |  | (256.2) | (103.4)
Total net revenue |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Maintenance and subscription |  |  |  |  |  |  |  |  |  | 40.4 | 6.2
License and other |  |  |  |  |  |  |  |  |  | (80.4) | (55.2)
Amortization of developed technology |  |  |  |  |  |  |  |  |  | 40.0 | 49.0
Total cost of revenue |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0

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