Document and Entity Information	6 Months Ended
	Sep. 30, 2012	Nov. 02, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
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		35,980,233
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2