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Receivables, net (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Current and long-term receivables balances    
Accounts receivable $ 205,415 $ 179,250
Unbilled accounts receivable 110,455 126,165
Long-term receivables 1,687 3,082
Total receivables 317,557 308,497
Less allowance for doubtful accounts (3,112) (869)
Total receivables, net $ 314,445 $ 307,628