The purchase price called by third party investor.

No definition available.

Name:	brs_CallOptionExercisedPurchasePrice
Namespace Prefix:	brs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Call option price held by noncontrolling interest.

+ References

No definition available.

+ Details

Name:	brs_CallOptionPriceHeldByNoncontrollingInterest
Namespace Prefix:	brs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This is the call option rate over LIBOR for our noncontrolling shareholder.

+ References

No definition available.

+ Details

Name:	brs_CallOptionRateOverLIBOR
Namespace Prefix:	brs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of classes of shares the company owns.

+ References

No definition available.

+ Details

Name:	brs_ClassOfSharesNumber
Namespace Prefix:	brs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of variable interest entities of which we are the primary beneficiary.

+ References

No definition available.

+ Details

Name:	brs_NumberOfVariableInterestEntities
Namespace Prefix:	brs_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

This is put option guaranteed rate for noncontrolling interest.

+ References

No definition available.

+ Details

Name:	brs_PutOptionGuaranteedRate
Namespace Prefix:	brs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Total Amount Paid For Deferred Shares

+ References

No definition available.

+ Details

Name:	brs_TotalAmountPaidForDeferredShares
Namespace Prefix:	brs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Shares acquired of VIE entity.

+ References

No definition available.

+ Details

Name:	brs_VariableInterestEntityDeferredStockPurchase
Namespace Prefix:	brs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) third party (directly or indirectly).

+ References

No definition available.

+ Details

Name:	brs_VariableInterestEntityQualitativeorQuantitativeInformationOwnershipPercentageThirdParty
Namespace Prefix:	brs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of the Variable Interest Entity's (VIE) voting interest purchased from (or beneficial interest in) third parties (directly or indirectly).

+ References

No definition available.

+ Details

Name:	brs_VariableInterestEntityQualitativeorQuantitativeInformationPurchasedPercentageFromThirdParty
Namespace Prefix:	brs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e7018-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6935-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_InterestPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Stated interest rate of the subordinated debt.

+ References

No definition available.

+ Details

Name:	us-gaap_SubordinatedBorrowingInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_UnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	brs_ThirdpartyAxis=brs_NigerianCompanyownedby100NigerianEmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	brs_ThirdpartyAxis=brs_EmployeeTrustFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=brs_BristowAviationHoldingsLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	brs_ThirdpartyAxis=brs_CaledoniaInvestmentsPlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	brs_ThirdpartyAxis=brs_E.U.InvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=brs_BristowHelicoptersNigeriaLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=brs_PanAfricanAirlinesNigeriaLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=brs_AviashelfAviationCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	brs_ThirdpartyAxis=brs_ImpigraAviationHoldingsLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

VARIABLE INTEREST ENTITIES - Narrative (Details) £ / shares in Units, £ in Millions	1 Months Ended		3 Months Ended			6 Months Ended	9 Months Ended
	Apr. 30, 2015	Jul. 31, 2014	Dec. 31, 2019	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) Affiliates	Sep. 30, 2019	Dec. 31, 2013	Jun. 30, 2019 GBP (£) Class_Of_Shares	Jun. 30, 2019 USD ($) Class_Of_Shares	Apr. 29, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 14, 2019 USD ($)	May 31, 2004 USD ($) shares	May 31, 2004 £ / shares	Apr. 30, 2004
Variable Interest Entity [Line Items]
Number of variable interest entities \| Affiliates					4
Deferred interest accrued									$ 11,201,000		$ 17,174,000
Nigerian Company owned by 100% Nigerian Employees
Variable Interest Entity [Line Items]
Ownership percentage by third party					50.00%
Purchased percentage from third party	2.00%	29.00%					19.00%
Employee Trust Fund
Variable Interest Entity [Line Items]
Ownership percentage by third party					2.00%
Bristow Aviation Holdings Limited
Variable Interest Entity [Line Items]
Ownership percentage in Variable Interest Entity					49.00%
Number of class of shares \| Class_Of_Shares								3	3
Purchase of deferred stock shares \| shares													8,000,000
Business acquisition share price \| £ / shares														£ 1
Total amount paid for deferred shares													$ 14,400,000
Principal amount of subordinated unsecured loan stock								£ 91.0	$ 115,800,000
Interest rate on unsecured loan					13.50%
Deferred interest accrued									$ 2,707,399,000		$ 2,399,704,000
Call option price held by noncontrolling interest \| £								£ 1.0
Call Option Rate Over LIBOR								3.00%	3.00%
Put Option Guaranteed Rate															10.00%
Bristow Aviation Holdings Limited \| Caledonia Investments Plc
Variable Interest Entity [Line Items]
Call Option, Exercised, Purchase Price										$ 920,000
Bristow Aviation Holdings Limited \| E.U. Investor
Variable Interest Entity [Line Items]
Call Option, Exercised, Purchase Price												$ 100,000
Bristow Helicopters Nigeria Ltd
Variable Interest Entity [Line Items]
Ownership percentage in Variable Interest Entity					48.00%
Purchased percentage from third party	8.00%
Pan African Airlines Nigeria Ltd
Variable Interest Entity [Line Items]
Ownership percentage in Variable Interest Entity					50.17%
Aviashelf Aviation Co. [Member]
Variable Interest Entity [Line Items]
Proceeds from Divestiture of Businesses					$ 2,600,000
Subsequent Event [Member] \| Impigra
Variable Interest Entity [Line Items]
Purchased percentage from third party			46.00%			5.00%
Subsequent Event [Member] \| Aviashelf Aviation Co. [Member]
Variable Interest Entity [Line Items]
Proceeds from Divestiture of Businesses				$ 400,000