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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Instruments (Details) - Level 3 - USD ($) $ in Thousands | 6 Months Ended
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Mar. 25, 2017 | Mar. 26, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 5,113 | $ 3,625
Estimated contingent performance-based consideration established at the time of acquisition | 0 | 2,590
Changes in the fair value of contingent performance-based payments established at the time of acquisition | 201 | 0
Performance-based payments made | (894) |
Ending balance | $ 4,420 | $ 6,215

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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