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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