Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 25, 2019	Sep. 25, 2019	Dec. 26, 2018
Finance lease liabilities [Line Items]
Document Period End Date		Sep. 25, 2019
Right-of-use assets:
Finance leases	$ 5,046	$ 5,046
Operating leases	279,975	279,975	$ 0
Total right-of-use assets	285,021	285,021
Other current liabilities, finance leases	1,796	1,796
Other long-term liabilities, finance leases	3,310	3,310
Operating Lease, Liability, Current	26,441	26,441	0
Operating Lease, Liability, Noncurrent	316,161	316,161	$ 0
Lease liabilities:
Finance leases	5,106	5,106
Operating leases	342,602	342,602
Total lease liabilities	347,708	347,708
Finance lease cost:
Amortization of right-of-use assets	538	1,491
Interest on lease liabilities	52	148
Operating lease cost	10,564	29,329
Short-term lease cost	279	313
Variable lease cost	4,338	11,636
Total lease cost	$ 15,771	$ 42,917
Weighted Average Lease Term [Abstract]
Finance leases	5 years 2 months 12 days	5 years 2 months 12 days
Operating leases	10 years	10 years
Weighted Average Discount Rate [Abstract]
Finance leases	3.90%	3.90%
Operating leases	4.70%	4.70%
Operating cash flows from finance leases		$ 148
Operating cash flows from operating leases		27,238
Financing cash flows from finance leases		1,433
Right-of-use assets obtained in exchange for new finance lease liabilities		1,927
Right-of-use assets obtained in exchange for new operating lease liabilities		$ 65,773