GOODWILL AND INTANGIBLE ASSETS - Summary of Amortizable Intangible Asset (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	$ 31,685	$ 31,685
Accumulated amortization	(4,729)	(2,360)
Intangible assets, Net	26,956	29,325
Goodwill, Gross	64,149	64,149
Goodwill	64,149	64,149	$ 64,149
Intangible Assets, Net (Including Goodwill) [Abstract]
Total intangible assets & goodwill, Gross	95,834	95,834
Total intangible assets & goodwill, Net	91,105	93,474
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	2	2
Accumulated amortization	(2)	(2)
Intangible assets, Net	$ 0	$ 0
Useful life	2 years	2 years
Brand and tradenames
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	$ 1,695
Accumulated amortization	(413)
Intangible assets, Net	$ 1,282
Brand and tradenames | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Brand and tradenames | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	7 years
Brand
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross		$ 1,695
Accumulated amortization		(226)
Intangible assets, Net		$ 1,469
Brand | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life		3 years
Brand | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life		7 years
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	$ 10,939	$ 10,939
Accumulated amortization	(2,804)	(1,421)
Intangible assets, Net	$ 8,135	$ 9,518
Developed Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years	5 years
Developed Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	6 years	6 years
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	$ 19,049	$ 19,049
Accumulated amortization	(1,510)	(711)
Intangible assets, Net	$ 17,539	$ 18,338
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years	10 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	18 years	18 years