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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Leases    
Operating cash flows from finance leases $ 606 $ 269
Financing cash flows from finance leases 2,139 781
Operating cash flows from operating leases 37,113 40,152
Right-of-use assets obtained in exchange for new finance lease liabilities 9,152 10,199
Right-of-use assets obtained in exchange for new operating lease liabilities 30,266 20,903
Cash received from sublease income $ 10,545 $ 10,139
Weighted-average remaining lease term of finance leases 4 years 8 months 15 days 4 years 9 months
Weighted-average remaining lease term of operating leases 7 years 7 years
Weighted-average discount rate of finance leases 5.34% 6.38%
Weighted-average discount rate of operating leases 6.65% 6.94%