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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
Income Tax Disclosure [Line Items] |  |  |
Federal statutory income tax rate | 34.00% |  |
Valuation allowance increase, amount | $ (64,800) | $ (52,200) | $ (43,100)
Release of deferred tax valuation allowance | 0 | $ (1,117) | $ (2,590)
Excess tax benefits from employee stock option exercises included in net operating loss and research and development tax credit forwards | 18,300 |  |
Federal |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carry forwards | 423,700 |  |
Tax credit carry forward | $ 10,700 |  |
Operating loss carryforwards expiration year | 2025 |  |
Research and development tax credit carryforwards expiration year | 2025 |  |
State |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carry forwards | $ 392,300 |  |
Tax credit carry forward | 11,500 |  |
Foreign |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carry forwards | $ 125,600 |  |

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