Related Parties - Additional Information (Detail) - Builders FirstSource, Inc [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Related Party Transaction [Line Items]
Total net sales to Builders FirstSource	$ 13.8	$ 12.8	$ 7.9
Accounts receivable due from Builders FirstSource	$ 2.2	$ 1.7