SEGMENT INFORMATION - Operating Performance and Total Assets by Segment (Details) - USD ($)	3 Months Ended		6 Months Ended			12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total earnings from unconsolidated affiliates, net of losses - equity method investments	$ 633,000	$ 1,461,000	$ 2,980,000		$ (86,000)
Loss on disposal of assets	(230,000)	(1,293,000)	(4,017,000)		(2,971,000)
Operating loss	(62,096,000)	(129,448,000)	(83,838,000)		(133,002,000)
Depreciation and amortization	31,303,000	30,489,000	62,642,000		61,430,000
Assets	2,792,575,000		2,792,575,000	$ 2,652,599,000
Total investments in unconsolidated affiliates - equity method	103,700,000		103,700,000	111,917,000
Construction in progress within property and equipment	20,500,000		20,500,000	51,700,000
Write-down of property	42,022,000	104,939,000	42,022,000		104,939,000
Construction in Progress [Member]
Segment Reporting Information [Line Items]
Write-down of property			30,600,000
OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense		2,400,000	6,000,000	2,000,000	5,900,000	$ 16,600,000
Europe Caspian
Segment Reporting Information [Line Items]
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(3,000)	(6,000)	168,000		19,000
Total business unit operating income	11,224,000	(11,414,000)	23,031,000		10,514,000
Depreciation and amortization	12,395,000	12,189,000	24,834,000		24,944,000
Assets	1,281,386,000		1,281,386,000	1,070,863,000
Total investments in unconsolidated affiliates - equity method	329,000		329,000	375,000
Europe Caspian | OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense		1,700,000	1,500,000		4,400,000
Africa
Segment Reporting Information [Line Items]
Total business unit operating income	6,528,000	1,465,000	14,273,000		2,606,000
Depreciation and amortization	5,007,000	3,665,000	9,998,000		7,079,000
Assets	351,345,000		351,345,000	325,502,000
Americas
Segment Reporting Information [Line Items]
Total earnings from unconsolidated affiliates, net of losses - equity method investments	315,000	1,573,000	2,491,000		136,000
Total business unit operating income	3,527,000	2,056,000	7,095,000		(5,287,000)
Depreciation and amortization	7,590,000	7,310,000	14,470,000		14,191,000
Assets	690,547,000		690,547,000	661,266,000
Total investments in unconsolidated affiliates - equity method	103,371,000		103,371,000	108,831,000
Asia Pacific
Segment Reporting Information [Line Items]
Total business unit operating income	(19,848,000)	(6,988,000)	(32,282,000)		(7,959,000)
Depreciation and amortization	2,970,000	4,054,000	6,691,000		8,409,000
Assets	171,809,000		171,809,000	255,136,000
Asia Pacific | OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense		700,000	4,500,000		1,500,000
Corporate and other
Segment Reporting Information [Line Items]
Total earnings from unconsolidated affiliates, net of losses - equity method investments	321,000	(106,000)	321,000		(241,000)
Total business unit operating income	(63,297,000)	(113,274,000)	(91,938,000)		(129,905,000)
Depreciation and amortization	3,341,000	$ 3,271,000	6,649,000		$ 6,807,000
Assets	297,488,000		297,488,000	339,832,000
Total investments in unconsolidated affiliates - equity method	$ 0		$ 0	$ 2,711,000