Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2017	Jun. 30, 2017
Goodwill [Line Items]
Gross Carrying Amount	$ 116,401	$ 57,438
Accumulated Amortization	(50,475)	(47,841)
Other intangible assets, net	65,926	9,597
Total definite-lived intangible assets, net	96,926	9,597
Indefinite-Lived Trade Names	31,000	0
Reacquired franchise rights
Goodwill [Line Items]
Gross Carrying Amount	$ 1,405	1,383
Estimated Useful Life (in years)	5 years
Weighted Average Remaining Useful Life (in years)	1 year 9 months 22 days
Dealer relationships
Goodwill [Line Items]
Gross Carrying Amount	$ 86,190	29,852
Weighted Average Remaining Useful Life (in years)	19 years 3 months 1 day
Patent
Goodwill [Line Items]
Gross Carrying Amount	$ 3,986	1,386
Weighted Average Remaining Useful Life (in years)	14 years 1 month 28 days
Trade name
Goodwill [Line Items]
Gross Carrying Amount	$ 24,667	24,667
Estimated Useful Life (in years)	15 years
Weighted Average Remaining Useful Life (in years)	3 years 8 months 13 days
Non-compete agreement
Goodwill [Line Items]
Gross Carrying Amount	$ 55	54
Estimated Useful Life (in years)	10 years
Weighted Average Remaining Useful Life (in years)	6 years 9 months 22 days
Backlog
Goodwill [Line Items]
Gross Carrying Amount	$ 98	$ 96
Estimated Useful Life (in years)	3 months 22 days
Weighted Average Remaining Useful Life (in years)	1 day
Minimum | Dealer relationships
Goodwill [Line Items]
Estimated Useful Life (in years)	8 years
Minimum | Patent
Goodwill [Line Items]
Estimated Useful Life (in years)	12 years
Maximum | Dealer relationships
Goodwill [Line Items]
Estimated Useful Life (in years)	15 years
Maximum | Patent
Goodwill [Line Items]
Estimated Useful Life (in years)	15 years