Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Lessee Lease Description [Line Items]
Operating lease existence of option to extend			true
Operating lease extension period			5 years
Operating lease existence of option to terminate			true
Operating lease not yet commenced description			no additional operating or finance leases that have not yet commenced
Finance lease not yet commenced description			no additional operating or finance leases that have not yet commenced
Previously Reported [Member]
Lessee Lease Description [Line Items]
Lease expenses	$ 2.3	$ 1.9	$ 6.6	$ 4.9	$ 6.4
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease term	1 year		1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease term	9 years		9 years
Operating lease termination period			1 year