Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Supplemental Cash Flow Elements [Abstract]
Operating leases	$ 28,112	$ 28,069
Finance leases	87	45
Cash paid for amounts included in the measurement of lease liabilities	28,199	28,114
Non-cash Investing Activities:
Property, equipment and intangibles purchased in accounts payable	4,517	9,503
Property, equipment and intangibles purchased for debt	7,913	18,252
Customer accounts receivable converted to notes receivable	0	400
Cash Financing Activities:
Proceeds from issuance of new debt	250,000	0
Borrowings on long-term debt	353	109,527
Payments of long-term debt	(11,921)	(14,127)
Payments of debt issuance and extinguishment costs, including underwriting fees	(4,136)	0
Change in long-term debt	234,296	95,400
Cash paid for amounts included in the measurement of finance lease liabilities	712	330
Non-cash Financing Activities:
Debt issuance costs deducted from long-term debt borrowings in accounts payable	697	0
Prepaid insurance funded through short-term debt borrowings	1,691	1,189
Prepaid ERP costs funded through short-term debt borrowings	0	1,430
Shares surrendered for tax obligations for employee share-based transactions in accrued liabilities	2	307
Accounts payable converted to installment notes	914	757
Other Supplemental Cash Flow Information:
Cash taxes paid, net of refunds	10,888	13,419
Cash interest paid	28,620	35,837
Leased assets obtained in exchange for new finance lease liabilities	394	247
Leased assets obtained in exchange for new operating lease liabilities	$ 15,250	$ 11,870