Leases - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 29, 2019	Dec. 29, 2018
Lessee Lease Description [Line Items]
Financing leases	$ 0
Cash paid for operating leases	$ 2,500,000
Rent expense for operating leases, including short-term equipment and storage rentals		$ 6,900,000
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease remaining lease term	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease remaining lease term	12 years