Leases - Summary of Components of Lease Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019
Leases [Abstract]
Operating lease cost	$ 3.2	$ 3.4
Short-term lease cost	0.3	0.2
Total lease cost	3.5	3.6
Operating cash flows from operating leases	$ 4.4	$ 3.4
Weighted-average remaining lease term – operating leases	2 years 3 months 18 days	2 years 10 months 24 days
Weighted-average discount rate – operating leases	5.50%	7.00%