FINANCING ARRANGEMENTS - Schedule of Senior Term Notes (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Principal amount on the Senior Term Notes				$ 123,000
Unamortized debt discount				(1,800)
Unamortized debt issuance costs				(600)
Senior Term Notes, net			$ 90,000	$ 120,599
Senior Notes | Senior term notes
Debt Instrument [Line Items]
Interest rate %	5.50%	5.50%	5.50%	5.50%
Repurchase amount	$ 124,200	$ 124,200
Unamortized premium	1,200	1,200
Repayments of debt	34,200
Interest expense		$ 1,700
Principal amount on the Senior Term Notes			$ 0	$ 123,000
Unamortized debt discount			0	(1,815)
Unamortized debt issuance costs			0	(586)
Senior Term Notes, net			$ 0	$ 120,599
Revolving Credit Facility | Line of Credit | Revolving Credit Facility, March 2018
Debt Instrument [Line Items]
Interest rate %			3.34%	0.00%
Proceeds from lines of credit	$ 90,000
Senior Term Notes, net			$ 90,000	$ 0