Acquisitions - Additional Information (Detail) - USD ($)		3 Months Ended
	Jul. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Amortization period of acquired goodwill for tax purpose		15 years
Net sales		$ 1,397,114,000	$ 370,986,000
Net income (loss)		(16,980,000)	(7,070,000)
Selling, General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related costs		$ 0	5,300,000
ProBuild Holdings LLC
Business Acquisition [Line Items]
Cash consideration for certain assets acquired	$ 1,630,000,000
Date of acquisition		Jul. 31, 2015
Fair value of acquired intangible assets	$ 184,509,000	$ 184,500,000
Net sales		982,700,000
Net income (loss)		$ 8,100,000
Transaction Costs Incurred by the Acquirer and the Acquiree
Business Acquisition [Line Items]
Acquisition related costs			6,300,000
Transaction Costs Incurred by the Acquiree
Business Acquisition [Line Items]
Acquisition related costs			1,000,000
Transaction Costs Incurred by the Acquirer
Business Acquisition [Line Items]
Acquisition related costs			$ 5,300,000