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Goodwill Intangible Assets and Other Long Term Assets - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 USD ($) | May 31, 2021 USD ($) | Oct. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) Segment | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |
Accounts receivable, net |  |  |  | $ 47,651 | $ 40,195 |
Inventories, net |  |  |  | 230,984 | 298,002 |
Short-term borrowings |  |  |  | 23,943 | 144,393 |
Accrued expenses |  |  |  | 86,594 | 51,616 |
Accounts payable |  |  |  | 25,739 | 37,343 |
Customer deposits |  |  |  | 100,660 | 31,821 | $ 24,300
Goodwill |  |  |  | 195,563 | 84,240 | 64,006
Revenue |  |  |  | 2,063,257 | 1,509,713 | 1,237,153
Estimated income before taxes |  |  |  | 205,794 | 97,440 | $ 48,953
Goodwill and other intangible assets, net |  |  |  | 201,122 | 84,293 |
Goodwill and other intangible assets increased from acquisitions |  |  |  | 116,800 | 20,200 |
Business acquisition, goodwill for tax purposes |  |  |  | $ 110,800 | 16,800 |
Number of reportable segments | Segment |  |  |  | 2 |  |
Other long-term assets |  |  |  | $ 8,818 | 7,774 |
long Term Deposits and Other Long Term Investments [Member] |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |
Other long-term assets |  |  |  | 8,800 | $ 7,800 |
Nisswa Marine, Inc [Member] |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |
Aggregate purchase price | $ 15,300 |  |  |  |  |
Cruisers Yachts [Member] |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |
Aggregate purchase price |  | $ 62,700 |  |  |  |
Accounts receivable, net |  | 3,100 |  |  |  |
Inventories, net |  | 26,200 |  |  |  |
Short-term borrowings |  | 11,700 |  |  |  |
Accrued expenses |  | 10,300 |  |  |  |
Accounts payable |  | 3,000 |  |  |  |
Goodwill |  | $ 40,134 |  |  |  |
Cruisers Yachts [Member] | Customer Relationships [Member] |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |
Weighted average useful life |  | 2 years |  |  |  |
SkipperBuds [Member] |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |
Aggregate purchase price |  |  | $ 55,000 |  |  |
Accounts receivable, net |  |  | 5,400 |  |  |
Inventories, net |  |  | 42,300 |  |  |
Short-term borrowings |  |  | 30,500 |  |  |
Accrued expenses |  |  | $ 14,600 |  |  |
Weighted average useful life |  |  | 3 years 3 months 18 days |  |  |
Maximum amount of consideration paid under earnout |  |  | $ 9,300 |  |  |
Fair value of contingent consideration |  |  | 8,200 |  |  |
Customer deposits |  |  | 7,500 |  |  |
Goodwill |  |  | 56,363 |  |  |
Other identifiable intangibles |  |  | $ 2,000 |  |  |
Revenue |  |  |  | 302,600 |  |
Estimated income before taxes |  |  |  | $ 31,300 |  |

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