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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Instruments (Details) - Level 3 - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2018 | Jun. 24, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 9,343 | $ 5,113
Estimated contingent performance-based consideration established at the time of acquisition | 0 | 0
Changes in the fair value of contingent performance-based payments established at the time of acquisition | (1,494) | 204
Performance-based payments | (204) | (1,222)
Ending balance | $ 7,645 | $ 4,095

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