Related Parties - Additional Information (Detail) - Builders FirstSource, Inc [Member] - USD ($) $ in Millions	12 Months Ended
Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Related Party Transaction [Line Items]
Total net sales to Builders FirstSource	$ 21.4	$ 21.9	$ 17.2
Accounts receivable due from Builders FirstSource	$ 1.9	$ 2.6

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant