Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 01, 2016	Jun. 26, 2015	Jul. 01, 2016	Jun. 26, 2015	Mar. 05, 2014
Income Taxes [Line Items]
Effective tax rates	17.20%	19.20%	14.70%	21.10%
Payment required for the Consent Agreement by DDTC compliance	$ 20,000,000		$ 20,000,000		$ 20,000,000
Penalty suspended and eligible for offset credit	10,000,000		10,000,000		$ 10,000,000
Non-deductible penalty			10,000,000
Non-deductible compliance expense		$ 700,000		$ 2,000,000
Income tax provision adjustment				$ 1,600,000
Change in unrecognized tax benefit within the next twelve months	$ 2,700,000		2,700,000
Maximum
Income Taxes [Line Items]
Non-deductible qualified expenditures			$ 10,000,000