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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Instruments (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended
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Dec. 24, 2016 | Dec. 26, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 5,113 | $ 3,625
Performance-based payments made | (860) |
Estimated contingent performance-based consideration established at the time of acquisition |  | 2,000
Ending balance | $ 4,253 | $ 5,625

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