Business Combinations - Summary of Preliminary Allocation of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022	Aug. 01, 2022
Business Acquisition [Line Items]
Goodwill	$ 994,155	$ 993,995
INTEX Millwork Solutions, LLC
Business Acquisition [Line Items]
Cash and cash equivalents	4,279
Trade receivables	790
Inventories	1,902
Other current assets	52
Property and equipment	3,612
Intangible assets	9,300
ROU assets	580
Accounts payable	(250)
Accrued expenses	(510)
Current lease liabilities	(114)
Noncurrent lease liabilities	(466)
Total identifiable assets	19,175
Goodwill	6,717
Net assets acquired/total consideration	25,892		$ 25,900
Less: cash acquired	(4,279)
Total consideration net of cash acquired	$ 21,613