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Basis of Presentation - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2021 Dealer Operations
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Recreational boat dealers | Dealer	30
Boat brokerage operations	4
Full-service yacht repair operations	2

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Boat brokerage operations number.

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- Definition

Full service yacht repair operations number.

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- Definition

Recreational boat dealers in number.

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