Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 27, 2020	Dec. 27, 2019
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	$ 183,849	$ 181,037
Less unamortized debt issuance costs	(2,740)	(2,983)
Total long-term debt, net	181,109	178,054
Less current portion	(8,750)	(8,750)
Total long-term debt, less current portion, net	172,359	169,304
Term Loan
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	159,687	161,875
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	$ 24,162	$ 19,162