Bristow Group Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

DEBT - Narrative (Details)

DEBT - Narrative (Details)				3 Months Ended		6 Months Ended		12 Months Ended
DEBT - Narrative (Details)	Aug. 18, 2020 USD ($)	Jun. 11, 2020 USD ($)	Dec. 07, 2012 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2010 promissory_note	Mar. 31, 2020 USD ($)	May 11, 2019	Apr. 17, 2018 subsidiary	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Repayments of debt						$ 85,369,000	$ 99,228,000
Long-term debt				$ 644,369,000		644,369,000			$ 561,124,000
Total long-term debt				580,342,000		580,342,000			515,385,000
Secured Debt
Debt Instrument [Line Items]
Long-term debt				17,069,000		17,069,000			0
Number of promissory notes \| promissory_note								2
Periodic payment				100,000
Reduction of final payment				100,000
Secured Debt \| PK Air Debt
Debt Instrument [Line Items]
Repayments of debt				5,400,000		10,600,000
Long-term debt				198,217,000		198,217,000			207,326,000
Secured Debt \| Macquarie Debt
Debt Instrument [Line Items]
Repayments of debt				2,400,000		4,800,000
Long-term debt				145,232,000		145,232,000			148,165,000
Secured Debt \| Lombard Debt
Debt Instrument [Line Items]
Repayments of debt				3,100,000		6,100,000
Long-term debt				$ 139,399,000		139,399,000			136,180,000
Secured Debt \| Promissory Note One
Debt Instrument [Line Items]
Long-term debt, gross												$ 19,000,000.0
Final payment						12,800,000
Secured Debt \| Promissory Note Two
Debt Instrument [Line Items]
Long-term debt, gross												$ 5,900,000
Final payment						$ 4,000,000.0
Senior Notes \| 7.750% Senior Notes
Debt Instrument [Line Items]
Stated interest rate			7.75%	7.75%		7.75%
Face amount			$ 200,000,000.0
Proceeds from issuance of long-term debt			$ 191,900,000
Long-term debt				$ 137,499,000		$ 137,499,000			0
Total long-term debt				136,800,000		136,800,000
Term Loan
Debt Instrument [Line Items]
Repayments of debt		$ 61,500,000
Long-term debt				$ 0		$ 0			$ 61,500,000
Prepayment of premium		$ 600,000
Convertible Debt \| 4½% Convertible Senior Notes due 2023
Debt Instrument [Line Items]
Stated interest rate				4.50%		4.50%
Effective percentage										11.00%
Contractual interest expense					$ 1,600,000		3,200,000
Increase in accrued interest					$ 1,600,000		$ 2,500,000
Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Long-term debt				$ 0		$ 0
Number of borrowers \| subsidiary											2
Line of credit increase, last in, last out tranche	$ 5,000,000.0
Maximum borrowing capacity	80,000,000.0
Maximum borrowing capacity increase	$ 115,000,000.0
Carrying amount \| Senior Notes \| 7.750% Senior Notes
Debt Instrument [Line Items]
Long-term debt				137,500,000		137,500,000
ABR Rate \| Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
ABR Rate \| Line of Credit \| Asset Backed Revolving Credit Facility, Swingline Loan
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
LIBOR or NIBOR \| Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%
Letter of Credit \| Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 9,200,000		$ 9,200,000