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Accounts Receivable (Details) - USD ($)
$ in Thousands
Oct. 26, 2019
Jul. 27, 2019
Jan. 26, 2019
Oct. 27, 2018
Jul. 28, 2018
Jan. 27, 2018
Receivables [Abstract]            
Contract with Customer, Asset, Net $ 323,298   $ 200,724      
Trade accounts receivable 408,188   331,903      
Unbilled accounts receivable 503,169   283,463      
Retainage 12,696   10,831      
Total 924,053   626,197      
Less: allowance for doubtful accounts (4,557) $ (924) (17,702) $ (946) $ (948) $ (998)
Less: allowance for doubtful accounts     (939)      
Accounts receivable, net $ 919,496   $ 625,258