Company Overview - Additional Information (Detail) $ in Millions			6 Months Ended
		Feb. 10, 2021 USD ($)	Mar. 31, 2021 USD ($) State Province	Mar. 31, 2020 USD ($)
Company Overview [Line Items]
Date of incorporation			Aug. 22, 1997
Proceeds from sale of business	[1],[2]		$ 837.0	$ 0.0
Stock Purchase Agreement [Member] | Interior Products [Member] | ASP Sailor Acquisition Corp [Member]
Company Overview [Line Items]
Proceeds from sale of business		$ 850.0
U.S. [Member]
Company Overview [Line Items]
Number of states in which entity operates | State			50
Canada [Member]
Company Overview [Line Items]
Number of provinces in which entity operates | Province			6

[1] See Note 3 for additional information.

[2] Unless otherwise noted, amounts include both continuing and discontinued operations.