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Organization and Basis of Presentation - Recently Adopted Accounting Guidance (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 26, 2020 | Jul. 26, 2020 | Jan. 27, 2020 | Jan. 26, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounting Standards Update | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member |  |
Retained earnings |  | $ (637,053) |  | $ (611,607)
ASU 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  | $ 300 |
Credit loss reserve on held-to-maturity securities |  |  | $ 400 |

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