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Income Taxes - Income Taxes Components Of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Stock-based compensation | $ 26.7 | $ 37.6
Research and development tax credit carryforwards | 170.3 | 136.7
Foreign tax credit carryforwards | 162.2 | 127.3
Accrued compensation and benefits | 25.9 | 39.5
Other accruals not currently deductible for tax | 22.9 | 18.7
Purchased technology and capitalized software | 43.4 | 76.9
Fixed assets | 16.5 | 24.3
Tax loss carryforwards | 85.7 | 173.6
Deferred revenue | 120.3 | 128.3
Other | 32.4 | 27.6
Total deferred tax assets | 706.3 | 790.5
Less: valuation allowance | (634.2) | (748.0)
Net deferred tax assets | 72.1 | 42.5
Indefinite lived intangibles | (57.0) | (70.1)
Total deferred tax liabilities | (57.0) | (70.1)
Net deferred tax assets | $ 15.1 |
Net deferred tax liabilities |  | $ (27.6)

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