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Receivables, net (Details) - USD ($)
$ in Thousands
Mar. 28, 2020
Dec. 28, 2019
Current and long-term receivables balances    
Accounts receivable $ 193,606 $ 179,250
Unbilled accounts receivable 93,502 126,165
Long-term receivables 2,380 3,082
Total receivables 289,488 308,497
Less allowance for doubtful accounts (3,015) (869)
Total receivables, net $ 286,473 $ 307,628