Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

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Derivative Financial Instruments - Additional Information (Detail) - USD ($)				6 Months Ended		12 Months Ended
	Aug. 08, 2016	Aug. 05, 2016	Mar. 28, 2012	Jul. 14, 2018	Jul. 15, 2017	Dec. 31, 2016	Dec. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Cash settlement on hedge	$ 1,000,000	$ 1,000,000	$ 3,100,000
Hedge ineffectiveness				$ 0	$ 0
Derivative instrument, asset				18,197,000			$ 16,324,000
Derivative instrument, liability				$ 0			$ 0
Selling, Distribution, and Administrative Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedge ineffectiveness						$ 100,000