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Sale-Leasebacks - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 28, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 28, 2018 USD ($)	Dec. 31, 2011 USD ($) building	Dec. 31, 2018 USD ($)
Sale Leaseback Transaction [Line Items]
Sale leaseback transaction, description				During fiscal 2011, the Company consummated two sale-leaseback transactions associated with the sale of two office buildings
Number of sale leaseback transaction associated with sale | building						2
Gain recognized to the sale leaseback transaction						$ 106,700
Deferred gain resulting from sale-leaseback transactions		$ 0		$ 0		$ 107,800	$ 46,004
Amortization of deferred gain		$ 0	$ 1,798	0	$ 5,440
Accounting Standards Update 2016-02
Sale Leaseback Transaction [Line Items]
Deferred gain balance recognized							$ 53,300
Cumulative effect adjustment to retained earnings				52,608
Accounting Standards Update 2016-02 | Deferred Tax Asset
Sale Leaseback Transaction [Line Items]
Cumulative effect adjustment to retained earnings	$ 700			$ 700

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Amount of gain (loss) on sale and leaseback transaction from transfer of asset accounted for as sale.

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