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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. 25, 2016 | Jun. 27, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | $ 3,625 | $ 4,414
Estimated contingent performance-based consideration established at the time of acquisition | 2,590 |
Changes in the fair value of contingent performance-based payments established at the time of acquisition | 140 | (71)
Ending balance | $ 6,355 | $ 4,343

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