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Goodwill Other Intangible Assets and Other Long Term Assets - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2021 USD ($) | Jul. 31, 2021 USD ($) | May 31, 2021 USD ($) | Oct. 31, 2020 USD ($) | Sep. 30, 2022 USD ($) Segment | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  | $ 50,287 | $ 47,651 |
Inventories |  |  |  |  | 454,359 | 230,984 |
Short-term borrowings |  |  |  |  | 132,026 | 23,943 |
Accrued expenses |  |  |  |  | 89,402 | 86,594 |
Accounts payable |  |  |  |  | 34,342 | 25,739 |
Customer deposits |  |  |  |  | 144,427 | 100,660 |
Goodwill |  |  |  |  | 235,585 | 195,563 | $ 84,240
Other identifiable intangibles |  |  |  |  | 10,886 | 5,559 |
Revenue |  |  |  |  | 2,308,098 | 2,063,257 | 1,509,713
Estimated income before taxes |  |  |  |  | 261,921 | 205,794 | $ 97,440
Other intangible assets, net |  |  |  |  | 10,886 | 5,559 |
Goodwill and other intangible assets increased from acquisitions |  |  |  |  | 45,300 | 116,800 |
Business acquisition, goodwill for tax purposes |  |  |  |  | $ 10,500 | 110,800 |
Number of reportable segments | Segment |  |  |  |  | 2 |  |
Other long-term assets |  |  |  |  | $ 9,455 | $ 8,818 |
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 |  |  | 26,200 |  |  |  |
Short-term borrowings |  |  | 11,700 |  |  |  |
Accrued expenses |  |  | 10,300 |  |  |  |
Accounts payable |  |  | 3,000 |  |  |  |
Goodwill |  |  | 40,134 |  |  |  |
Intangible assets |  |  | 4,602 |  |  |  |
Cash acquired |  |  | $ 5,993 |  |  |  |
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 |  |  |  | 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 |  |
Other intangible assets, net |  |  |  | 2,000 |  |  |
Estimated contingent consideration |  |  |  | 8,200 |  |  |
Intangible assets |  |  |  | 1,978 |  |  |
Cash acquired |  |  |  | 30,615 |  |  |
Aggregate consideration |  |  |  | $ 58,461 |  |  |
Intrepid And Texas Master Craft [Member] |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |
Tangible assets acquired | $ 20,300 |  |  |  |  |  |
Goodwill | 39,600 |  |  |  |  |  |
Estimated contingent consideration | 6,000 |  |  |  |  |  |
Intangible assets | 7,300 |  |  |  |  |  |
Cash acquired | 9,400 |  |  |  |  |  |
Aggregate consideration | 67,200 |  |  |  |  |  |
Texas Master Craft [Member] |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |
Goodwill | $ 10,700 |  |  |  |  |  |

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