Document and Entity Information - shares	9 Months Ended
	Dec. 31, 2018	Jun. 14, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Entity Registrant Name	Bristow Group Inc.
Entity Central Index Key	0000073887
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		35,918,916
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes
Entity Shell Company	false