Leases - Summary of Components of Lease Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 25, 2020
Leases [Abstract]
Operating lease cost	$ 18.9	$ 13.1
Short-term lease cost	1.9	1.3
Sublease income	(0.1)	(0.1)
Total lease cost	20.7	14.3
Operating cash flows from operating leases	$ 20.4	$ 16.9
Weighted-average remaining lease term – operating leases	1 year 2 months 12 days	2 years 3 months 18 days
Weighted-average discount rate – operating leases	5.50%	5.50%