Leases - Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 27, 2020	Dec. 29, 2019
Leases [Abstract]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets	us-gaap:OtherAssets
Operating lease right-of-use assets	$ 52,304	$ 53,549
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Current operating lease liabilities	$ 9,056	$ 7,853
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Noncurrent operating lease liabilities	$ 52,695	$ 55,136
Total operating lease liabilities	$ 61,751	$ 62,989