Leases - Cash and Non-cash Lease Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Lessee, Lease, Description [Line Items]
Operating Lease, Payments	$ 24,913	$ 26,450
Finance Lease, Principal Payments	39	68	$ 132
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	5,863	10,595
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	1,677	0
Derecognition of ROU assets due to terminations, impairment or modifications	(569)	(4,731)
Operating Lease ROU assets	177,129	192,395
Operating lease liabilities	198,565
Property Lease [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Payments	23,683	25,168
Finance Lease, Principal Payments	34	68
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	5,850	10,339
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	1,623	0
Derecognition of ROU assets due to terminations, impairment or modifications	$ (543)	$ (4,574)
Finance Lease, Weighted Average Remaining Lease Term	18 years 11 months 23 days	2 years 9 months 29 days
Operating Lease, Weighted Average Remaining Lease Term	11 years 5 months 12 days	12 years 29 days
Finance Lease, Weighted Average Discount Rate, Percent	2.50%	11.10%
Operating Lease, Weighted Average Discount Rate, Percent	4.29%	4.38%
Equipment Lease [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Payments	$ 1,230	$ 1,282
Finance Lease, Principal Payments	5	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	13	256
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	54	0
Derecognition of ROU assets due to terminations, impairment or modifications	$ (26)	$ (157)
Finance Lease, Weighted Average Remaining Lease Term	4 years 6 months 7 days
Operating Lease, Weighted Average Remaining Lease Term	2 years 3 months 21 days	3 years 2 months 12 days
Finance Lease, Weighted Average Discount Rate, Percent	1.68%	0.00%
Operating Lease, Weighted Average Discount Rate, Percent	3.93%	3.96%
ASU 2016-02 | Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Operating Lease ROU assets			205,223
Operating lease liabilities			222,283
ASU 2016-02 | Cumulative Effect, Period of Adoption, Adjustment | Property Lease [Member]
Lessee, Lease, Description [Line Items]
Operating Lease ROU assets			200,555
Operating lease liabilities			217,615
ASU 2016-02 | Cumulative Effect, Period of Adoption, Adjustment | Equipment Lease [Member]
Lessee, Lease, Description [Line Items]
Operating Lease ROU assets	$ 0		4,668
Operating lease liabilities	$ 0		$ 4,668