SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 333,176	$ 366,668
Direct cost and reimbursable expense	273,893	295,955
Intercompany expenses	0	0
Pre-petition restructuring charges	13,476	0
Depreciation and amortization	31,339	30,941
General and administrative	34,770	40,101
Operating expense	353,478	366,997
Loss on disposal of assets	(3,787)	(1,678)
Earnings from unconsolidated affiliates, net of losses	2,347	(1,547)
Operating loss	(21,742)	(3,554)
Interest expense, net	(26,321)	(27,144)
Reorganization items	(76,356)	0
Loss on sale of subsidiaries	(56,303)	0
Other expense, net	(3,873)	(3,950)
Loss before benefit (provision) for income taxes	(184,595)	(34,648)
Benefit for income taxes	15,507	2,851
Net income (loss)	(169,088)	(31,797)
Net income attributable to noncontrolling interests	(158)	(67)
Net loss attributable to Bristow Group	(169,246)	(31,864)
External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	333,176	366,668
Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue	(24,677)	(26,517)
Direct cost and reimbursable expense	0	0
Intercompany expenses	(24,677)	(26,517)
Pre-petition restructuring charges	0
Depreciation and amortization	0	0
General and administrative	0	0
Operating expense	(24,677)	(26,517)
Loss on disposal of assets	0	0
Earnings from unconsolidated affiliates, net of losses	100,957	7,065
Operating loss	100,957	7,065
Interest expense, net	0	0
Reorganization items	0
Loss on sale of subsidiaries	0
Other expense, net	0	0
Loss before benefit (provision) for income taxes	100,957	7,065
Benefit for income taxes	0	0
Net income (loss)	100,957	7,065
Net income attributable to noncontrolling interests	0	0
Net loss attributable to Bristow Group	100,957	7,065
Eliminations \| External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Eliminations \| Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	(24,677)	(26,517)
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Revenue	0	45
Direct cost and reimbursable expense	119	16
Intercompany expenses	0	0
Pre-petition restructuring charges	12,449
Depreciation and amortization	3,137	3,066
General and administrative	9,711	12,788
Operating expense	25,416	15,870
Loss on disposal of assets	0	(806)
Earnings from unconsolidated affiliates, net of losses	(100,957)	(7,065)
Operating loss	(126,373)	(23,696)
Interest expense, net	(13,367)	(16,379)
Reorganization items	(49,845)
Loss on sale of subsidiaries	0
Other expense, net	119	134
Loss before benefit (provision) for income taxes	(189,466)	(39,941)
Benefit for income taxes	20,235	8,092
Net income (loss)	(169,231)	(31,849)
Net income attributable to noncontrolling interests	(15)	(15)
Net loss attributable to Bristow Group	(169,246)	(31,864)
Parent Company Only \| External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	0	45
Parent Company Only \| Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	62,476	60,652
Direct cost and reimbursable expense	41,624	41,876
Intercompany expenses	0	0
Pre-petition restructuring charges	0
Depreciation and amortization	17,661	18,222
General and administrative	3,930	3,798
Operating expense	63,215	63,896
Loss on disposal of assets	(476)	(1,160)
Earnings from unconsolidated affiliates, net of losses	0	0
Operating loss	(1,215)	(4,404)
Interest expense, net	(5,865)	(6,830)
Reorganization items	(26,051)
Loss on sale of subsidiaries	0
Other expense, net	501	1,075
Loss before benefit (provision) for income taxes	(32,630)	(10,159)
Benefit for income taxes	(1,176)	893
Net income (loss)	(33,806)	(9,266)
Net income attributable to noncontrolling interests	0	0
Net loss attributable to Bristow Group	(33,806)	(9,266)
Guarantor Subsidiaries \| External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	37,799	34,135
Guarantor Subsidiaries \| Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	24,677	26,517
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	295,377	332,488
Direct cost and reimbursable expense	232,150	254,063
Intercompany expenses	24,677	26,517
Pre-petition restructuring charges	1,027
Depreciation and amortization	10,541	9,653
General and administrative	21,129	23,515
Operating expense	289,524	313,748
Loss on disposal of assets	(3,311)	288
Earnings from unconsolidated affiliates, net of losses	2,347	(1,547)
Operating loss	4,889	17,481
Interest expense, net	(7,089)	(3,935)
Reorganization items	(460)
Loss on sale of subsidiaries	(56,303)
Other expense, net	(4,493)	(5,159)
Loss before benefit (provision) for income taxes	(63,456)	8,387
Benefit for income taxes	(3,552)	(6,134)
Net income (loss)	(67,008)	2,253
Net income attributable to noncontrolling interests	(143)	(52)
Net loss attributable to Bristow Group	(67,151)	2,201
Non- Guarantor Subsidiaries \| External Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	295,377	332,488
Non- Guarantor Subsidiaries \| Intercompany Customer
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 0	$ 0

Bristow Group Inc 10-Q