Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Sep. 26, 2015	Jun. 27, 2015
Liabilities:
Total liabilities	$ 6,355	$ 3,625	$ 4,343
Liability for Contingent Consideration
Liabilities:
Total liabilities	6,355	3,625	4,343
Level 1
Liabilities:
Total liabilities	0	0	0
Level 1 | Liability for Contingent Consideration
Liabilities:
Total liabilities	0	0	0
Level 2
Liabilities:
Total liabilities	0	0	0
Level 2 | Liability for Contingent Consideration
Liabilities:
Total liabilities	0	0	0
Level 3
Liabilities:
Total liabilities	6,355	3,625	4,343
Level 3 | Liability for Contingent Consideration
Liabilities:
Total liabilities	$ 6,355	$ 3,625	$ 4,343