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ORGANIZATION AND BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Thousands						3 Months Ended								12 Months Ended
	Apr. 30, 2018 shares	Jan. 31, 2018 shares	Oct. 31, 2017 shares	Jul. 31, 2017 shares	Oct. 01, 2013	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares	Sep. 30, 2016 $ / shares	Jun. 30, 2018 USD ($) segment $ / shares shares	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares
Schedule of Organization [Line Items]
Number of reportable segments | segment														2
Common stock owned, member owners, percentage						40.00%				37.00%				40.00%	37.00%
Diluted earnings (loss) per share (in dollars per share)						$ (6.17)	$ (1.93)	$ 0.06	$ 0.30	$ (6.10)	$ (1.60)	$ 1.58	$ 0.26	$ 1.36	$ 1.51	$ 0.97
Limited partnership, limited partners ownership percentage														60.00%	63.00%
Term of tax receivable agreement														15 years
Estimated amount of tax savings recorded as a liability, as a percentage						85.00%								85.00%
Revenue sharing (participation agreements), percent														30.00%
Remeasurement of tax receivable agreement liabilities | $														$ 177,174	$ 5,447	$ 4,818
Common Class B Unit
Schedule of Organization [Line Items]
Exchange agreement conversion ratio														0.1429
Common stock conversion ratio						1								1
Member Owners
Schedule of Organization [Line Items]
Resale shelf registration statement effective term					7 years
Probation period for company-directed underwritten public offering					60 days
Class B Common Stock
Schedule of Organization [Line Items]
Exchange of Class B common units for Class A common stock by member owners (in shares) | shares	642,566	1,006,435	3,651,294	1,231,410										6,531,705
Two Largest GPO Member Owners | Minimum
Schedule of Organization [Line Items]
Participation agreements, automatic extension term														5 years
Two Largest GPO Member Owners | Maximum
Schedule of Organization [Line Items]
Participation agreements, automatic extension term														7 years
Previously stated
Schedule of Organization [Line Items]
Diluted earnings (loss) per share (in dollars per share)								$ (1.66)	$ 0.36			$ 1.50				$ 1.33

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