Goodwill - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 01, 2022	Nov. 03, 2021	Oct. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Schedule Of Goodwill And Other Assets [Line Items]
Goodwill				$ 558,613,000		$ 558,613,000		$ 235,585,000
Goodwill and other intangible assets, net				600,700,000		600,700,000		246,500,000
Accounts receivable, net				116,910,000		116,910,000		50,287,000
Contract liabilities				113,934,000		113,934,000		144,427,000
Accrued expenses				113,803,000		113,803,000		89,402,000
Goodwill				558,613,000		558,613,000		235,585,000
Revenue				570,340,000	$ 610,106,000	1,078,267,000	$ 1,082,797,000
Income (Loss) before taxes				42,125,000	$ 71,129,000	69,141,000	117,694,000
Inventories				711,296,000		711,296,000		$ 454,359,000
Intrepid and Texas MasterCraft [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Aggregate consideration		$ 67,200,000
Cash acquired		9,400,000
Estimated contingent consideration		6,000,000.0
Tangible assets acquired		20,300,000
Intangible assets		7,300,000
Goodwill		39,600,000
Goodwill		39,600,000
Texas MasterCraft [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Goodwill		10,700,000
Goodwill		$ 10,700,000
IGY Marinas [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Aggregate consideration	$ 551,257,000
Aggregate purchase price			$ 480,000,000
Maximum amount of consideration paid under earnout			100,000,000.0
Fair value of contingent consideration			$ 67,700,000
Cash acquired	28,075,000
Estimated contingent consideration	67,700,000
Intangible assets	30,446,000
Goodwill	293,469,000
Accounts receivable, net	4,500,000
Other current assets	4,100,000
Contract liabilities	13,300,000
Tax contingency reserves	8,000,000.0
Accrued expenses	6,300,000
Goodwill	293,469,000
Other identifiable intangibles	30,400,000
Goodwill expected to be deductible for tax purposes	$ 136,400,000
Revenue						66,400,000	6,900,000
Income (Loss) before taxes						13,500,000	$ 3,600,000
Series of notes receivable				$ 6,500,000		$ 6,500,000
IGY Marinas [Member] | Customer Relationships [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Weighted average useful life	4 years 6 months