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Significant Accounting Policies - Recently Adopted Accounting Guidance (Details) - USD ($) $ in Thousands | Jan. 31, 2021 | Jan. 27, 2020 | Jan. 26, 2020
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in retained earnings | $ 671,196 |  | $ 611,607
Deferred income tax assets | 25,483 |  | 20,094
Prepaid taxes | (22,083) |  | (10,718)
Right-of-use assets | 16,337 |  | 10,958
Lease liabilities | $ 17,147 |  | 11,458
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in retained earnings |  | $ (300) |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  | $ 400 | $ 400

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