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Accounts Receivable (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 27, 2018 | Jan. 26, 2019 | Jan. 28, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Bad debt expense, net | $ (38) | $ 27 |
Contract with Customer, Asset, Gross | 369,472 | 215,849 | $ 57,800
Accounts Receivable, Net, Current | 318,684 | 625,258 | 630,400
Trade accounts receivable | 300,271 | 331,903 |
Unbilled Contracts Receivable | 0 | 283,463 |
Retainage | 19,411 | 10,831 |
Total | 319,682 | 626,197 |
Less: allowance for doubtful accounts | (998) | (939) |
Accounts receivable, net | 318,700 | 625,258 | 630,400
Contract liabilities | 6,480 | 15,125 |
Contract with Customer, Asset, Net | $ 362,992 | 200,724 |
Windstream |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable, net |  | 45,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Contract with Customer, Asset, Gross |  | (283,463) |
Accounts Receivable, Net, Current |  | 283,463 | $ 311,700
Windstream |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, Gross, Noncurrent |  | $ 24,800 |

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