DOCUMENT AND ENTITY INFORMATION (USD $)	12 Months Ended
	Mar. 31, 2015	May 15, 2015	Sep. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Entity Registrant Name	Bristow Group Inc.
Entity Central Index Key	0000073887
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		34,839,335
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 2,255,674,848