Quarterly report pursuant to Section 13 or 15(d)

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

v3.3.1.900
Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Instruments (Detail) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Dec. 26, 2015
Dec. 27, 2014
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 2,000  
Changes in the fair value of contingent performance-based payments established at the time of acquisition 0 0
Ending balance $ 5,625 $ 4,414