Related Party Transactions - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 26, 2020 USD ($) Supplier	Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)
Related Party Transaction [Line Items]
Rental payments based upon the terms of the lease | $	$ 1.8	$ 1.6	$ 1.6
Lease effective date	Jan. 01, 2018
Purchases from companies and from PTI prior to full acquisition | $	$ 10.7	$ 23.2	$ 20.3
Joint Venture [Member]
Related Party Transaction [Line Items]
Number of suppliers with company partners Joint Venture | Supplier	1
Minority interests in number of suppliers | Supplier	2
Colmar, PA [Member]
Related Party Transaction [Line Items]
Lease expiration date	Dec. 31, 2022
Lewisberry, PA [Member]
Related Party Transaction [Line Items]
Lease expiration date	Dec. 31, 2027