VARIABLE INTEREST ENTITIES - Balance Sheets of VIEs (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 172,534		$ 178,055
Restricted cash	3,234		0
Accounts receivable	227,073		216,791
Inventories	114,997		121,308
Prepaid expenses and other current assets	42,803		44,009
Total current assets	562,316		565,513
Investment in unconsolidated affiliates	120,494		118,203
Property and equipment, net	1,774,822		1,834,180
Right-of-use asset	187,961		0
Goodwill	18,212		18,436
Other assets	104,150		116,267
Total assets	2,767,955		2,652,599
Accounts payable	85,894		99,573
Accrued liabilities	222,153		150,648
Accrued interest	11,201		17,174
Short-term borrowings and current maturities of long-term debt	892,092		1,418,630
Total current liabilities	1,200,139		1,668,851
Long-term debt, less current maturities	75,789		8,223
Accrued pension liabilities	22,472		25,726
Other liabilities and deferred credits	8,080		26,229
Deferred taxes	84,075		111,203
Pre-petition restructuring charges	13,476	$ 0
Long-term operating lease liabilities	103,567		0
Total Liabilities	2,112,113		1,840,232
Bristow Aviation Holdings Limited
Variable Interest Entity [Line Items]
Cash and cash equivalents	69,201		83,499
Restricted cash	3,234		0
Accounts receivable	325,905		307,864
Inventories	80,200		85,977
Prepaid expenses and other current assets	29,436		36,646
Total current assets	507,976		513,986
Investment in unconsolidated affiliates	3,013		3,087
Property and equipment, net	248,671		281,944
Right-of-use asset	196,725		0
Goodwill	18,212		18,436
Other assets	226,115		229,902
Total assets	1,200,712		1,047,355
Accounts payable	455,070		442,187
Accrued liabilities	265,031		113,905
Accrued interest	2,707,399		2,399,704
Short-term borrowings and current maturities of long-term debt	81,706		85,287
Total current liabilities	3,509,206		3,041,083
Long-term debt, less current maturities	383,556		384,369
Accrued pension liabilities	22,472		25,726
Other liabilities and deferred credits	4,038		4,810
Deferred taxes	37,662		37,063
Long-term operating lease liabilities	37,591		0
Total Liabilities	$ 3,994,525		$ 3,493,051