v3.8.0.1
DOCUMENT AND ENTITY INFORMATION - USD ($)
12 Months Ended
Mar. 31, 2018
May 18, 2018
Sep. 30, 2017
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Mar. 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   35,649,881  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 301,657,750