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BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) flight_hour | Oct. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) contract | Dec. 07, 2012
Item Affected [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  |  | $ 3,493,000 | $ 2,459,000 |  |
Allowance for doubtful accounts receivable |  |  |  | 400,000 | 400,000 |  |
Pre-operating costs | $ 0 | $ 8,800,000 |  |  |  | $ 9,800,000 |
Number of client contracts | contract |  |  |  |  |  | 2 |
Amortization of other deferred charges |  |  | $ 2,400,000 |  |  |  |
Useful lives, hour restriction | flight_hour | 30,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Item Affected [Line Items] |  |  |  |  |  |  |
Useful lives |  | P5Y |  |  |  |  |
Salvage value | 5.00% | 30.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |
Item Affected [Line Items] |  |  |  |  |  |  |
Useful lives | P30Y | P15Y |  |  |  |  |
Salvage value | 25.00% | 50.00% |  |  |  |  |
Affiliated Entity |  |  |  |  |  |  |
Item Affected [Line Items] |  |  |  |  |  |  |
Allowance for doubtful accounts receivable |  |  |  | 0 | $ 0 |  |
Post-emergence bankruptcy related payments |  |  |  |  |  |  |
Item Affected [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  |  | 800,000 |  |  |
Norway payroll withholding taxes |  |  |  |  |  |  |
Item Affected [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  |  | $ 2,700,000 |  |  |
Senior Notes | 7.750% Senior Notes |  |  |  |  |  |  |
Item Affected [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 7.75% |  |  | 7.75%

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