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Income Taxes - Income Taxes Components Of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Jan. 31, 2017 | Jan. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Stock-based compensation | $ 37.6 | $ 37.5
Research and development tax credit carryforwards | 136.7 | 91.3
Foreign tax credit carryforwards | 127.3 | 51.1
Accrued compensation and benefits | 39.5 | 41.5
Other accruals not currently deductible for tax | 18.7 | 23.6
Purchased technology and capitalized software | 76.9 | 64.3
Fixed assets | 24.3 | 18.6
Tax loss carryforwards | 173.6 | 17.6
Deferred Revenue | 128.3 | 56.7
Other | 27.6 | 13.9
Total deferred tax assets | 790.5 | 416.1
Less: valuation allowance | (748.0) | (398.0)
Net deferred tax assets | 42.5 | 18.1
Indefinite lived intangibles | (70.1) | (54.1)
Unremitted earnings of foreign subsidiaries | 0.0 | (22.4)
Total deferred tax liabilities | (70.1) | (76.5)
Net deferred tax liabilities | $ (27.6) | $ (58.4)

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