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Accounts Receivable (Details) - USD ($) $ in Thousands | Oct. 27, 2018 | Jan. 28, 2018 | Jan. 27, 2018
--- | --- | --- | ---
Receivables [Abstract] |  |  |
Trade accounts receivable | $ 464,332 |  | $ 300,271
Unbilled accounts receivable | 372,351 |  | 0
Retainage | 14,032 |  | 19,411
Total | 850,715 |  | 319,682
Less: allowance for doubtful accounts | (946) |  | (998)
Accounts receivable, net | $ 849,800 | $ 630,400 | $ 318,700

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