GOODWILL AND INTANGIBLES - Summary of Amortizable Intangible Asset (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 31,685	$ 31,685
Intangible Assets, Accumulated Amortization	(3,152)	(2,360)
Intangible Assets, Net	28,533	29,325
Goodwill, Gross	64,149	64,149
Goodwill, Net	64,149	64,149	$ 11,492
Intangible Assets, Net (Including Goodwill) [Abstract]
Total intangible assets & goodwill, gross	95,834	95,834
Total intangible assets & goodwill, net	92,682	93,474
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	2	2
Intangible Assets, Accumulated Amortization	(2)	(2)
Intangible Assets, Net	$ 0	$ 0
Amortization Period	2 years	2 years
Brand and tradenames
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 1,695
Intangible Assets, Accumulated Amortization	(291)
Intangible Assets, Net	$ 1,404
Brand and tradenames | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	3 years
Brand and tradenames | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	7 years
Brand
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 1,695
Intangible Assets, Accumulated Amortization		(226)
Intangible Assets, Net		$ 1,469
Brand | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period		3 years
Brand | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period		7 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 10,939	$ 10,939
Intangible Assets, Accumulated Amortization	(1,882)	(1,421)
Intangible Assets, Net	$ 9,057	$ 9,518
Developed technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	5 years	5 years
Developed technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	6 years	6 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 19,049	$ 19,049
Intangible Assets, Accumulated Amortization	(977)	(711)
Intangible Assets, Net	$ 18,072	$ 18,338
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 years	10 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	18 years	18 years