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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

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