Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 27, 2014
Commitments and Contingencies Disclosure [Abstract]
Outstanding letters of credit	$ 2,500
Restricted cash	10,910	$ 13,157
Estimated annual purchase commitments for fiscal 2017	104,600
Estimated annual purchase commitments for fiscal 2018	37,300
Estimated annual purchase commitments for fiscal 2019	20,500
Estimated annual purchase commitments for fiscal 2020	14,100
Estimated annual purchase commitments for fiscal 2021	6,700
Estimated annual purchase commitments for thereafter	$ 600
Minimum operating lease agreement terms	1 year
Maximum operating lease agreement terms	13 years
Operating lease rental expense	$ 25,000	$ 23,100	$ 21,300