LEASES, Rent Expense (Details) - USD ($) $ in Thousands  | 
5 Months Ended | 7 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Mar. 31, 2020  | 
Oct. 31, 2019  | 
Mar. 31, 2019  | 
Mar. 31, 2018  | 
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| Leases [Abstract] | ||||
| Operating leases rental expense | $ 50,061 | $ 101,543 | $ 192,316 | $ 208,691 | 
| Aircraft | ||||
| Leases [Abstract] | ||||
| Operating leases rental expense | $ 43,044 | $ 88,599 | $ 168,299 | $ 181,318 | 
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- 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. No definition available. 
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef 
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- Details 
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