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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

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