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Receivables, net (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Current and long-term receivables balances    
Accounts receivable $ 160,998 $ 164,223
Unbilled accounts receivable 114,226 136,795
Long-term receivables 1,204 5,972
Total receivables 276,428 306,990
Less allowance for doubtful accounts (310) (3,936)
Total receivables, net $ 276,118 $ 303,054