VARIABLE INTEREST ENTITIES (Details) £ / shares in Units, $ in Thousands, £ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jun. 30, 2015 USD ($) Affiliates Nominations	Jun. 30, 2014 USD ($)	Dec. 31, 2013	Jun. 30, 2015 GBP (£) Class_Of_Shares voting_rights	Jun. 30, 2015 USD ($) Class_Of_Shares voting_rights	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	May. 31, 2004 USD ($) shares	May. 31, 2004 £ / shares	Apr. 30, 2004
Variable Interest Entities [Line Items]
Number of variable interest entities | Affiliates		4
Cash and cash equivalents			$ 133,804			$ 120,394	$ 104,146	$ 204,341
Accounts Receivable, Net, Current						258,277	258,618
Inventories						151,947	147,169
Prepaid expenses and other current assets						60,640	70,091
Assets, Current						629,894	637,851
Investment in unconsolidated affiliates						223,233	216,376
Property, Plant and Equipment, Net						2,146,172	2,157,101
Goodwill						77,998	75,628
Other assets						165,394	143,764
Total assets						3,242,691	3,230,720
Accounts payable						98,253	84,193
Accrued liabilities						243,491	258,445
Accrued interest						5,612	12,831
Current deferred taxes						4,133	17,704
Current maturities of long-term debt						26,954	18,730
Liabilities, Current						372,831	435,006
Total long-term debt						918,247	845,692
Accrued pension liabilities						101,911	99,576
Other liabilities and deferred credits						31,224	39,782
Deferred taxes						169,380	165,655
Redeemable noncontrolling interests						$ 35,342	26,223
Revenues		$ 466,996	472,538
Net loss		$ (1,629)	45,003
Caledonia Investments Plc [Member]
Variable Interest Entities [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage, Third Party		46.00%
European Union [Member]
Variable Interest Entities [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage, Third Party		5.00%
Nigerian Company owned by 100% Nigerian Employees [Member]
Variable Interest Entities [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage, Third Party		50.00%
Variable Interest Entity, Qualitative or Quantitative Information, Purchased Percentage From Third Party	29.00%	2.00%		19.00%
Employee Trust Fund [Member]
Variable Interest Entities [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage, Third Party		2.00%
Bristow Aviation Holdings Limited [Member]
Variable Interest Entities [Line Items]
Ownership percentage in Variable Interest Entity		49.00%
Class Of Shares, Number | Class_Of_Shares					3	3
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage, Third Party		51.00%
Purchase of deferred stock shares | shares									8,000,000
Business acquisition share price | £ / shares										£ 1
Total Amount Paid For Deferred Shares									$ 14,400
Principal amount of subordinated unsecured loan stock					£ 91.0	$ 143,100
Interest rate on unsecured loan		13.50%
Deferred interest cost		$ 1,500,000
Call option price held by noncontrolling interest | £					£ 1.0
Call Option Rate Over LIBOR					3.00%	3.00%
Call Option Guaranteed Rate									12.00%
Put Option Guaranteed Rate											10.00%
Cash and cash equivalents						$ 101,968	91,190
Accounts Receivable, Net, Current						548,317	521,989
Inventories						108,878	100,065
Prepaid expenses and other current assets						47,440	42,659
Assets, Current						806,603	755,903
Investment in unconsolidated affiliates						183	64
Property, Plant and Equipment, Net						256,591	243,357
Goodwill						62,767	61,242
Other assets						88,687	78,637
Total assets						1,214,831	1,139,203
Accounts payable						446,428	379,357
Accrued liabilities						170,819	154,306
Accrued interest						1,538,961	1,489,369
Current deferred taxes						0	1,128
Current maturities of long-term debt						9,454	9,643
Liabilities, Current						2,165,662	2,033,803
Total long-term debt						174,375	168,245
Accrued pension liabilities						101,911	99,576
Other liabilities and deferred credits						11,197	11,948
Deferred taxes						13,950	14,457
Redeemable noncontrolling interests						35,342	26,223
Liabilities						$ 2,502,437	$ 2,354,252
Revenues		386,771	383,817
Operating income (loss)		(17,743)	16,700
Net loss		$ (64,777)	$ (37,581)
Bristow Aviation Holdings Limited [Member] | Caledonia Investments Plc [Member]
Variable Interest Entities [Line Items]
Number Of Voting Rights | voting_rights					3	3
Number of Board Of Directors Nomination | Nominations		2
Bristow Helicopters Nigeria Ltd [Member]
Variable Interest Entities [Line Items]
Ownership percentage in Variable Interest Entity		48.00%
Variable Interest Entity, Qualitative or Quantitative Information, Purchased Percentage From Third Party		8.00%
Pan African Airlines Nigeria Ltd [Member]
Variable Interest Entities [Line Items]
Ownership percentage in Variable Interest Entity		50.17%
Director [Member] | Bristow Aviation Holdings Limited [Member]
Variable Interest Entities [Line Items]
Number Of Voting Rights | voting_rights					1	1
Director Two [Member] | Bristow Aviation Holdings Limited [Member]
Variable Interest Entities [Line Items]
Number Of Voting Rights | voting_rights					1	1