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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

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