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Accrued Liabilities - Summary (Details) - USD ($) $ in Thousands | Jan. 26, 2020 | Jan. 27, 2019
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Payables and Accruals [Abstract] |  |
Compensation | $ 20,817 | $ 34,987
Contract liabilities (ASC 606) | 8,581 | 10,073
Lease liabilities (ASC 842) | 3,273 | 0
Earn-out liability | 2,108 | 3,276
Professional fees | 2,449 | 2,336
Deferred revenue | 3,931 | 3,439
Deferred compensation | 1,365 | 2,203
Income taxes payable | 0 | 2,105
Environmental reserve | 1,450 | 1,460
Other | 6,658 | 8,583
Accrued liabilities | $ 50,632 | $ 68,462

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