BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Other accrued liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued lease costs	$ 12,189	$ 5,601
Deferred OEM cost recovery	10,413	0
Eastern overdraft liability	9,486	5,829
Accrued property and equipment	5,158	3,546
Deferred gain on sale leasebacks	1,305	1,655
Other operating accruals	33,741	30,048
Other accrued liabilities	$ 72,292	$ 46,679