ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Shareholders' equity	$ 146,019	$ 92,241	$ 93,452	$ 98,215	$ 104,433	$ 113,346	$ 103,205	$ 114,423
Retained earnings
Financing Receivable, Allowance for Credit Loss [Line Items]
Shareholders' equity	$ (314,040)	$ (312,192)	$ (309,290)	(303,025)	$ (291,611)	$ (282,316)	$ (273,938)	$ (262,430)
Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
Payment terms	30 days
Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Payment terms	60 days
Impact of adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Line Items]
Shareholders' equity				348
Impact of adoption of ASC 326 | Retained earnings
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounts receivable and financing receivable, allowance for credit loss, current				300
Shareholders' equity				$ 348