SEGMENT INFORMATION - Operating Performance and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 3,047,798		$ 3,165,002
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(3,017)	$ (665)
Gain (loss) on disposal of assets	(1,678)	699
Operating loss	(3,798)	(24,618)
Depreciation and amortization	30,941	31,056
Total investments in unconsolidated affiliates - equity method	108,323		119,884
Construction in progress within property and equipment	73,100		67,700
OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	3,500		16,600
Europe Caspian
Segment Reporting Information [Line Items]
Assets	1,023,734		1,087,437
Total earnings from unconsolidated affiliates, net of losses - equity method investments	25	30
Total business unit operating income	21,928	4,371
Depreciation and amortization	12,755	11,822
Total investments in unconsolidated affiliates - equity method	250		270
Europe Caspian | OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	2,700
Africa
Segment Reporting Information [Line Items]
Assets	393,887		374,121
Total business unit operating income	1,141	10,048
Depreciation and amortization	3,414	3,076
Americas
Segment Reporting Information [Line Items]
Assets	747,800		788,879
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(2,907)	(535)
Total business unit operating income	(7,587)	(1,256)
Depreciation and amortization	6,881	6,999
Total investments in unconsolidated affiliates - equity method	105,054		116,276
Asia Pacific
Segment Reporting Information [Line Items]
Assets	338,347		342,166
Total business unit operating income	(971)	(12,530)
Depreciation and amortization	4,355	5,810
Asia Pacific | OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	800
Corporate and other
Segment Reporting Information [Line Items]
Assets	544,030		572,399
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(135)	(160)
Total business unit operating income	(16,631)	(25,950)
Depreciation and amortization	3,536	$ 3,349
Total investments in unconsolidated affiliates - equity method	$ 3,019		$ 3,338