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Accounts Receivable, Contract Assets, and Contract Liabilities - Change in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 25, 2020 | Jul. 31, 2021 | Jul. 25, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cumulative effect from implementation of ASU 2016-13 | $ 4,237 | $ 5,166 | $ 1,676 | $ 4,582
Provision for bad debt | 78 | 119 | 2,901 | 236
Amounts charged against the allowance | (2,788) | (3,680) | (3,050) | (3,684)
Allowance for doubtful accounts at end of period | 1,527 | 1,605 | 1,527 | 1,605
Cumulative effect from implementation of ASU 2016-13 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cumulative effect from implementation of ASU 2016-13 | $ 0 | $ 0 | $ 0 | $ 471

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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- Definition Amount of increase (decrease) in allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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