Leases - Summary of Components of Lease Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 26, 2021	Mar. 27, 2020
Leases [Abstract]
Operating lease cost	$ 3.7	$ 3.2
Short-term lease cost	0.4	0.3
Total lease cost	4.1	3.5
Operating cash flows from operating leases	$ 3.7	$ 4.4
Weighted-average remaining lease term – operating leases	2 years 4 months 24 days	2 years 3 months 18 days
Weighted-average discount rate – operating leases	5.50%	5.50%