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Accounts Receivable, Contract Assets, and Contract Liabilities - Accounts Receivable (Details) - USD ($) $ in Thousands | Jul. 25, 2020 | Apr. 25, 2020 | Jan. 25, 2020 | Jul. 27, 2019 | Apr. 27, 2019 | Jan. 26, 2019
--- | --- | --- | --- | --- | --- | ---
Receivables [Abstract] |  |  |  |  |  |
Trade accounts receivable | $ 378,461 |  | $ 355,805 |  |  |
Unbilled accounts receivable | 508,123 |  | 453,353 |  |  |
Retainage | 12,854 |  | 12,669 |  |  |
Total | 899,438 |  | 821,827 |  |  |
Less: allowance for doubtful accounts | (1,605) | $ (5,166) | (4,582) | $ (924) | $ (1,372) | $ (17,702)
Accounts receivable, net | $ 897,833 |  | $ 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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