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Receivables, net (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Current and long-term receivables balances    
Accounts receivable $ 194,093 $ 179,250
Unbilled accounts receivable 108,877 126,165
Long-term receivables 3,208 3,082
Total receivables 306,178 308,497
Less allowance for doubtful accounts (2,557) (869)
Total receivables, net $ 303,621 $ 307,628