Leases - Minimum Future Lease Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019
Lessee, Lease, Description [Line Items]
Finance Lease, Liability, Payments Due Year One	$ 126
Finance Lease, Liability, Payments, Due Year Two	150
Finance Lease, Liability, Payments, Due Year Three	105
Finance Lease, Liability, Payments, Due Year Four	105
Finance Lease, Liability, Payments, Due Year Five	101
Finance Leases, Future Minimum Payments Due Thereafter	1,684
Total	2,271
Finance Lease, Liability, Undiscounted Excess Amount	(509)
Present value of lease obligations	1,762
Less: current maturities	(70)	$ (34)
Obligations under finance leases, net of current portion	1,692	83
Operating Leases, Future Minimum Payments, Due in One Year	28,952
Operating Leases, Future Minimum Payments, Due in Two Years	26,460
Operating Leases, Future Minimum Payments, Due in Three Years	24,115
Operating Leases, Future Minimum Payments, Due in Four Years	21,821
Operating Leases, Future Minimum Payments, Due in Five Years	19,371
Operating Leases, Future Minimum Payments, Due Thereafter	125,221
Total	245,940
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(47,375)
Present value of lease obligations	198,565
Less: current maturities	(19,907)	(16,406)
Noncurrent portion	178,658	$ 197,492
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Next Twelve Months	2,897
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Two Years	3,312
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Three Years	3,345
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Four Years	3,231
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Five Years	2,881
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Thereafter	24,476
Total	$ 40,142
Minimum
Lessee, Lease, Description [Line Items]
Imputed interest rate	1.68%
Maximum
Lessee, Lease, Description [Line Items]
Imputed interest rate	4.29%