Document and Entity Information - shares
3 Months Ended
Jun. 30, 2017
Jul. 28, 2017
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2017  
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   35,327,801
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1