BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Other accrued liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
Accrued lease costs	$ 1,291	$ 6,017
Deferred OEM cost recovery	0	3,997
Accrued legal and professional fees	10,054	3,070
Accrued property and equipment	709	997
Deferred gain on sale leasebacks	919	1,305
Other operating accruals	19,800	14,437
Other accrued liabilities	32,773	38,679
Eastern Airways International Limited [Member]
Other accrued liabilities	$ 0	$ 8,856