SEGMENT INFORMATION - Operating Performance and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total earnings from unconsolidated affiliates, net of losses - equity method investments	$ 2,347	$ (1,547)
Loss on disposal of assets	(3,787)	(1,678)
Operating loss	(21,742)	(3,554)
Depreciation and amortization	31,339	30,941
Assets	2,767,955			$ 2,652,599
Total investments in unconsolidated affiliates - equity method	114,208			111,917
Construction in progress within property and equipment	48,800			51,700
Construction in Progress [Member] | Subsequent Event [Member]
Segment Reporting Information [Line Items]
Write-down of property and equipment			$ 30,600
OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	1,000	3,500		3,400	$ 16,600
Europe Caspian
Segment Reporting Information [Line Items]
Total earnings from unconsolidated affiliates, net of losses - equity method investments	171	25
Total business unit operating income	11,807	21,928
Depreciation and amortization	12,439	12,755
Assets	1,131,538			1,070,863
Total investments in unconsolidated affiliates - equity method	360			375
Europe Caspian | OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	2,700
Africa
Segment Reporting Information [Line Items]
Total business unit operating income	7,745	1,141
Depreciation and amortization	4,991	3,414
Assets	349,541			325,502
Americas
Segment Reporting Information [Line Items]
Total earnings from unconsolidated affiliates, net of losses - equity method investments	2,176	(1,437)
Total business unit operating income	3,568	(7,343)
Depreciation and amortization	6,880	6,881
Assets	667,639			661,266
Total investments in unconsolidated affiliates - equity method	111,195			108,831
Asia Pacific
Segment Reporting Information [Line Items]
Total business unit operating income	(12,434)	(971)
Depreciation and amortization	3,721	4,355
Assets	249,769			255,136
Asia Pacific | OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	800
Corporate and other
Segment Reporting Information [Line Items]
Total earnings from unconsolidated affiliates, net of losses - equity method investments	0	(135)
Total business unit operating income	(28,641)	(16,631)
Depreciation and amortization	3,308	$ 3,536
Assets	369,468			339,832
Total investments in unconsolidated affiliates - equity method	$ 2,653			$ 2,711