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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - VIE Narrative (Details) £ / shares in Units, $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Jul. 31, 2014 | Jun. 30, 2020 USD ($) affiliate Class_Of_Shares | Dec. 31, 2013 | Mar. 31, 2020 USD ($) Loan | Jun. 30, 2020 GBP (£) Class_Of_Shares | Mar. 31, 2019 | May 31, 2004 USD ($) shares | May 31, 2004 £ / shares
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of variable interest entities | affiliate |  |  | 5 |  |  |  |  |  |
Deferred interest accrued |  |  | $ 943 |  | $ 832 |  |  |  |
Bristow Helicopters Leasing Limited And Sakhalin Bristow Air Services Ltd |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling ownership percentage |  |  |  |  |  |  | 60.00% |  |
Bristow Aviation Holdings Limited | VIE, primary beneficiary |  |  |  |  |  |  |  |  |
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 (in shares) | shares |  |  |  |  |  |  |  | 8,000,000 |
Business acquisition share price (in USD per share) | £ / shares |  |  |  |  |  |  |  |  | £ 1
Total amount paid for deferred shares |  |  |  |  |  |  |  | $ 14,400 |
Principal amount of subordinated unsecured loan stock |  |  | $ 112,400 |  |  | £ 91.0 |  |  |
Interest rate on unsecured loan |  |  | 13.50% |  |  |  |  |  |
Deferred interest accrued |  |  | $ 2,775,938 |  | $ 2,697,878 |  |  |  |
Call option price held by noncontrolling interest | £ |  |  |  |  |  | £ 1.0 |  |  |
Call option rate over LIBOR |  |  | 3.00% |  |  | 3.00% |  |  |
Bristow Helicopters Nigeria Ltd |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Purchased Percentage From Third Party | 8.00% |  |  |  |  |  |  |  |
Bristow Helicopters Nigeria Ltd | VIE, primary beneficiary |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage in Variable Interest Entity |  |  | 48.00% |  |  |  |  |  |
Pan African Airlines Nigeria Ltd | VIE, primary beneficiary |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage in Variable Interest Entity |  |  | 50.17% |  |  |  |  |  |
Impigra Aviation Holdings Limited | VIE, primary beneficiary |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage in Variable Interest Entity |  |  | 100.00% |  |  |  |  |  |
Impigra Aviation Holdings Limited | Bristow Aviation Holdings Limited |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage in Variable Interest Entity |  |  | 51.00% |  | 51.00% |  |  |  |
Number of loans | Loan |  |  |  |  | 2 |  |  |  |
Nigerian Company | Bristow Helicopters Nigeria Ltd |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage in Variable Interest Entity |  |  | 50.00% | 19.00% |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Purchased Percentage From Third Party | 2.00% | 29.00% |  |  |  |  |  |  |
Nigerian Employees | Nigerian Company |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling ownership percentage |  |  | 100.00% |  |  | 100.00% |  |  |
Employee Trust Fund | Bristow Helicopters Nigeria Ltd |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage in Variable Interest Entity |  |  | 2.00% |  |  |  |  |  |

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