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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES VIE Narrative (Details) £ / shares in Units, £ in Millions, $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2014	Apr. 30, 2015	Dec. 31, 2013	Mar. 31, 2018 USD ($) Affiliates Class_Of_Shares Nominations voting_rights shares	Mar. 31, 2018 GBP (£) Class_Of_Shares voting_rights	May 31, 2004 USD ($) shares	May 31, 2004 £ / shares	Apr. 30, 2004
Variable Interest Entity [Line Items]
Number of variable interest entities \| Affiliates				4
Caledonia Investments Plc
Variable Interest Entity [Line Items]
Ownership percentage in variable interest entity, third party				46.00%
European Union
Variable Interest Entity [Line Items]
Ownership percentage in variable interest entity, third party				5.00%
Nigerian Company owned by 100% Nigerian Employees
Variable Interest Entity [Line Items]
Ownership percentage in variable interest entity, third party				50.00%
VIE, qualitative or quantitative information, purchased percentage from third party	29.00%	2.00%	19.00%
Employee Trust Fund
Variable Interest Entity [Line Items]
Ownership percentage in variable interest entity, third party				2.00%
Bristow Aviation Holdings Limited
Variable Interest Entity [Line Items]
Ownership percentage in VIE				49.00%
Class of shares, number \| Class_Of_Shares				3	3
Ownership percentage in variable interest entity, third party				51.00%
Purchase of deferred stock shares \| shares						8,000,000
Business acquisition, share price \| £ / shares							£ 1
Principal amount of subordinated unsecured loan stock				$ 127.7	£ 91.0
Interest rate on unsecured loan				13.50%
Total amount paid for deferred shares \| $						$ 14.4
Deferred interest cost \| $				$ 2,100.0
Bristow Aviation Holdings Limited \| Call Option
Variable Interest Entity [Line Items]
Common Stock value \| £					£ 1.0
Call option guaranteed rate				3.00%	3.00%	12.00%
Bristow Aviation Holdings Limited \| Put option
Variable Interest Entity [Line Items]
Call option guaranteed rate								10.00%
Bristow Aviation Holdings Limited \| Director one
Variable Interest Entity [Line Items]
Number of voting rights				1	1
Bristow Aviation Holdings Limited \| Director two
Variable Interest Entity [Line Items]
Number of voting rights				1	1
Bristow Aviation Holdings Limited \| Caledonia Investments Plc
Variable Interest Entity [Line Items]
Number of voting rights				3	3
Number of board of directors nomination \| Nominations				2
Shareholder Agreement, Ownership, Number of Parent Common Stock Requirement \| shares				1,000,000
Shareholder Agreement, Ownership, Percentage of Parent Common Stock Requirement				49.00%
Bristow Helicopters Nigeria Ltd
Variable Interest Entity [Line Items]
Ownership percentage in VIE				48.00%
VIE, qualitative or quantitative information, purchased percentage from third party		8.00%
Pan African Airlines Nigeria Ltd
Variable Interest Entity [Line Items]
Ownership percentage in VIE				50.17%