Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Instruments (Detail)

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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Instruments (Detail) - Level 3 [Member] - USD ($)
$ in Thousands
9 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 4,414 $ 4,165
Changes in the fair value of contingent performance-based payments established at the time of acquisition (71) 249
Ending balance $ 4,343 $ 4,414