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Accounts Receivable, Contract Assets, and Contract Liabilities - Change in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 24, 2020 | Oct. 26, 2019 | Oct. 24, 2020 | Oct. 26, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for doubtful accounts at beginning of period | $ 1,605 | $ 924 | $ 4,582 | $ 17,702
Provision for bad debt (recovery) | 117 | 3,498 | 353 | (7,015)
Amounts recovered (charged) against the allowance | 29 | 135 | (3,655) | (6,130)
Allowance for doubtful accounts at end of period | 1,751 | 4,557 | 1,751 | 4,557
Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for doubtful accounts at beginning of period |  |  | 471 |
Allowance for doubtful accounts at end of period | $ 0 | $ 0 | 0 | $ 0
Windstream Corporation |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for doubtful accounts at beginning of period |  |  | $ 16,800 |

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