Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended		12 Months Ended	15 Months Ended
	Sep. 26, 2015 USD ($) Interest_Rate_Swaps gal	Sep. 27, 2014 USD ($)	Oct. 01, 2016 USD ($)	Dec. 31, 2016 gal	Jun. 27, 2015 USD ($)
Derivative [Line Items]
Non-monetary notional amount volume | gal	13,200,000
Unrealized gain (losses) on derivative instruments	$ (1,200,000)	$ (200,000)
Expense for cash settlements in derivative instruments	(1,000,000)	$ 0
Aggregate fair value amount of derivative instruments	12,000,000				$ 8,900,000
Collateral posted relating to credit risk related contingent features	0
Termination value of derivatives	12,000,000
Other Expense [Member]
Derivative [Line Items]
Unrealized gain (losses) on derivative instruments	$ (1,200,000)
Scenario Forecast [Member]
Derivative [Line Items]
Reclassification earnings to interest expense			$ 6,400,000
Non-monetary notional amount volume | gal				7,800,000
Interest Rate Swaps [Member]
Derivative [Line Items]
Number of interest rate swaps | Interest_Rate_Swaps	5
Notional Amount	$ 750,000,000