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Income Taxes - Income Taxes Components Of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Jan. 31, 2016 | Jan. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Stock-based compensation | $ 37.5 | $ 39.9
Research and development tax credit carryforwards | 91.3 | 62.6
Foreign tax credit carryforwards | 51.1 | 0.0
Accrued compensation and benefits | 41.5 | 43.6
Other accruals not currently deductible for tax | 23.6 | 18.4
Purchased technology and capitalized software | 64.3 | 53.9
Fixed assets | 18.6 | 16.2
Tax loss carryforwards | 17.6 | 16.0
Deferred Revenue | 56.7 | 48.0
Other | 13.9 | 7.4
Total deferred tax assets | 416.1 | 306.0
Less: valuation allowance | (398.0) | (70.8)
Net deferred tax assets | 18.1 | 235.2
Indefinite lived intangibles | (54.1) | (40.7)
Unremitted earnings of foreign subsidiaries | (22.4) | (9.4)
Total deferred tax liabilities | (76.5) | (50.1)
Net deferred tax liabilities | $ (58.4) |
Net deferred tax assets |  | $ 185.1

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