Leases - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 27, 2020	Sep. 27, 2020	Sep. 29, 2019
Leases [Abstract]
Gain on sale-leaseback transactions	$ 400	$ 226	$ 289
Lease assets and liabilities resulting from lease modifications and new leases		47,209	49,097
Operating cash flows from operating leases		73,749	62,986
Operating cash flows from finance leases		26	204
Financing cash flows from finance leases		$ 1,464	$ 1,555