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Accounts Receivable, Contract Assets, and Contract Liabilities - Accounts Receivable (Details) - USD ($) $ in Thousands | Oct. 24, 2020 | Jul. 25, 2020 | Jan. 25, 2020 | Oct. 26, 2019 | Jul. 27, 2019 | Jan. 26, 2019
--- | --- | --- | --- | --- | --- | ---
Receivables [Abstract] |  |  |  |  |  |
Trade accounts receivable | $ 367,980 |  | $ 355,805 |  |  |
Unbilled accounts receivable | 559,067 |  | 453,353 |  |  |
Retainage | 13,645 |  | 12,669 |  |  |
Total | 940,692 |  | 821,827 |  |  |
Less: allowance for doubtful accounts | (1,751) | $ (1,605) | (4,582) | $ (4,557) | $ (924) | $ (17,702)
Accounts receivable, net | $ 938,941 |  | $ 817,245 |  |  |

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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