FAIR VALUE DISCLOSURES Recurring and Non-recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Fair Value [Line Items]
Rabbi Trust investments	$ 2,500
Inventories	121,308	$ 129,614
Assets held for sale	5,350	30,348
Investment in unconsolidated affiliates	118,203	131,527
Property and equipment	1,834,180	2,068,020
Goodwill	18,436	19,907	$ 19,798
Other intangible assets	19,145	19,517	19,043
Impairment of inventories	(9,276)	(5,717)	(7,572)
Impairment charges on assets held for sale	(8,149)	(15,853)	(12,450)
Impairment of aircraft and equipment	(104,939)	0	0
Impairments of other intangible assets	(3,005)	0	0
Impairments of investments in unconsolidated affiliates	0	(85,683)	0
Impairment of goodwill	0	0	$ (8,706)
Total loss on sale of assets and asset impairment charges	(125,369)	(107,253)
Fair value, measurements, recurring
Fair Value [Line Items]
Derivative financial instrument	1,845	718
Rabbi Trust investments	2,544	2,296
Assets, Fair Value Disclosure	4,389	3,014
Fair value, inputs, Level 1 \| Fair value measurements nonrecurring
Fair Value [Line Items]
Assets, Fair Value Disclosure	0	0
Inventories	0	0
Assets held for sale	0	0
Investment in unconsolidated affiliates		0
Property and equipment	0
Other intangible assets	0
Fair value, inputs, Level 1 \| Fair value, measurements, recurring
Fair Value [Line Items]
Derivative financial instrument	0	0
Rabbi Trust investments	2,544	2,296
Assets, Fair Value Disclosure	2,544	2,296
Fair value, inputs, Level 2 \| Fair value measurements nonrecurring
Fair Value [Line Items]
Assets, Fair Value Disclosure	0	515
Inventories	0	515
Assets held for sale	0	0
Investment in unconsolidated affiliates		0
Property and equipment	0
Other intangible assets	0
Fair value, inputs, Level 2 \| Fair value, measurements, recurring
Fair Value [Line Items]
Derivative financial instrument	1,845	718
Rabbi Trust investments	0	0
Assets, Fair Value Disclosure	1,845	718
Fair value, inputs, Level 3 \| Fair value measurements nonrecurring
Fair Value [Line Items]
Assets, Fair Value Disclosure	149,385	92,615
Inventories	7,697	0
Assets held for sale	5,350	30,348
Investment in unconsolidated affiliates		62,267
Property and equipment	136,338
Other intangible assets	0
Fair value, inputs, Level 3 \| Fair value, measurements, recurring
Fair Value [Line Items]
Derivative financial instrument	0	0
Rabbi Trust investments	0	0
Assets, Fair Value Disclosure	$ 0	$ 0

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