VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES Other Significant Affiliates - Unconsoildated Tables (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates	$ 118,203	$ 131,527
Cost Method Investment Dividends Or Distributions	2,518	2,518	$ 2,068
Income (Loss) from Equity Method Investments	1,799	16,181	18,271
Earnings from unconsolidated affiliates, net of losses	4,317	18,699	20,339
Proceeds from Equity Method Investment, Distribution	200	400	400
Equity Method Investment, Summarized Financial Information [Abstract]
Current assets	152,438	221,169
Non-current assets	274,401	293,409
Total assets	426,839	514,578
Current liabilities	106,658	131,664
Non-current liabilities	160,082	188,822
Equity	160,099	194,092
Total liabilities and equity	426,839	514,578
Revenue	254,617	298,731	327,351
Gross profit	47,894	46,717	50,371
Net income	$ (7,115)	$ 13,285	14,581
Petroleum Air Services
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%	25.00%
Investment in unconsolidated affiliates	$ 6,286	$ 6,286
Cougar
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	40.00%	40.00%
Investment in unconsolidated affiliates	$ 58,047	$ 59,366
Business acquisition, percentage of voting interests acquired	25.00%	25.00%
Income (Loss) from Equity Method Investments	$ 4,100	$ 9,084	10,537
Lider
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	41.90%	41.90%
Investment in unconsolidated affiliates	$ 50,784	$ 62,267
Business acquisition, percentage of voting interests acquired	20.00%	20.00%
Income (Loss) from Equity Method Investments	$ (2,059)	$ 7,179	8,064
Other Unconsolidated Significant Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates	3,086	3,608
Income (Loss) from Equity Method Investments	$ (242)	$ (82)	$ (330)

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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