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Significant Accounting Policies - Summary of Revenue Disaggregated Into Categories Depict the Nature, Amount, Timing, and Uncertainty of Revenue and Cash Flows Affected by Economic Factor (Detail) - Product Concentration Risk [Member] - Sales [Member]	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	100.00%	100.00%	100.00%
Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	100.00%	100.00%	100.00%
Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	100.00%	100.00%
New Boat Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	73.20%	70.50%	70.20%
New Boat Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	71.90%	70.30%	70.20%
New Boat Sales [Member] | Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	100.00%	100.00%
Used Boat Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	7.30%	10.90%	15.10%
Used Boat Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	7.70%	11.00%	15.10%
Maintenance, Repair, Storage, Rental, and Charter Services [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	7.40%	7.10%	6.40%
Maintenance, Repair, Storage, Rental, and Charter Services [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	7.70%	7.10%	6.40%
Finance and Insurance Products [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.00%	2.70%	2.70%
Finance and Insurance Products [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.10%	2.70%	2.70%
Parts and Accessories [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.30%	3.20%	3.00%
Parts and Accessories [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.50%	3.20%	3.00%
Brokerage Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	5.80%	5.60%	2.60%
Brokerage Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	6.10%	5.70%	2.60%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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