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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisition Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended	9 Months Ended
	Jul. 06, 2017	Dec. 31, 2017	Mar. 31, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Goodwill			$ 32,478	$ 12,692
Cobalt Boats, LLC
Business Acquisition [Line Items]
Cash consideration paid	$ 129,525
Equity consideration paid	$ 1,000
Business acquisition, share price (in dollars per share)	$ 25.47
Acquired finite-lived intangible assets, weighted average useful life	19 years 9 months 18 days
Fair value of total consideration transferred	$ 130,525
Goodwill	$ 19,791
Acquisition related costs		$ 3,478
Common Stock \| Class A Common Stock
Business Acquisition [Line Items]
Issuance of Class A common stock for offerings, net of underwriting discounts (in shares)			2,300,000
Common Stock \| Cobalt Boats, LLC \| Class A Common Stock
Business Acquisition [Line Items]
Issuance of Class A common stock for offerings, net of underwriting discounts (in shares)	39,262
Dealer relationships \| Cobalt Boats, LLC
Business Acquisition [Line Items]
Useful Life (in years)	20 years
Patent \| Cobalt Boats, LLC
Business Acquisition [Line Items]
Useful Life (in years)	15 years