BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
	Jun. 30, 2017 USD ($) aircraft	Jun. 30, 2016 USD ($) aircraft	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($) Customer
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Deferred Tax Liabilities, Gross, Current				$ 800,000
Interest income	$ 214,000	$ 234,000
Interest expense	(16,235,000)	(11,120,000)
Interest expense, net	(16,021,000)	(10,886,000)
Allowance for doubtful accounts receivable, current			$ 3,500,000	4,500,000
Inventory allowance			22,700,000	21,500,000
Inventory Write-down	1,192,000
Deferred Set-up Costs, Current			9,800,000	9,700,000
Amortization of other deferred charges	$ 2,900,000	$ 2,200,000
Deferred set-up costs, noncurrent			52,200,000	51,100,000
Number of aircraft delivered | aircraft	3	0
Capital expenditures	$ 12,553,000	$ 21,063,000
Progress payments for aircraft	$ 1,300,000	$ 3,100,000
Number of aircraft sold or disposed of | aircraft	6	6
Proceeds from asset dispositions	$ 41,975,000	$ 11,500,000
Gain (loss) on disposal of assets	$ 699,000	$ (10,017,000)
Number of aircraft impaired | aircraft	2	11
Impairment charges on aircraft held for sale	$ 1,564,000	$ 10,149,000
Accelerated depreciation		$ 6,900,000
Number of aircraft in exit plan | aircraft		11
Deferred Income Taxes and Other Assets, Current				100,000
Unamortized debt issuance cost			11,118,000	11,345,000
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	19,798,000		19,907,000	19,798,000
Accumulated goodwill impairment	(50,861,000)		(50,861,000)	(50,861,000)
Goodwill - beginning balance	19,798,000
Goodwill foreign currency translation	109,000
Goodwill - ending balance	19,907,000
Accumulated goodwill impairment - beginning balance	(50,861,000)
Goodwill impairments	0
Accumulated goodwill impairment - ending balance	(50,861,000)
Intangible assets - beginning balance	27,212,000
Foreign currency translation	157,000
Intangible assets - ending balance	27,369,000
Accumulated amortization of intangible assets - beginning balance	(21,476,000)
Amortization of Intangible Assets	(215,000)
Accumulated amortization of intangible assets - ending balance	$ (21,691,000)
Weighted average remaining contractual life, in years	5 years 2 months 12 days
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year			688,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two			623,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three			383,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four			383,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five			383,000
Finite-Lived Intangible Assets, Amortization Expense, after Year Five			3,218,000
Finite-Lived Intangible Assets, Net			5,678,000
Foreign Currency [abstract]
Foreign Currency Transaction Gain (Loss), before Tax	$ (1,700,000)	$ (6,300,000)
Impact of Foreign Exchange Rates on Unconsolidated affiliates	(1,138,000)	(48,000.000)
Revenues	352,109,000	369,398,000
Operating expense	(375,540,000)	(389,446,000)
Earnings from unconsolidated affiliates, net of losses	(665,000)	3,830,000
Income (loss) before provision for income taxes	(42,255,000)	(43,310,000)
Provision for income taxes	(13,491,000)	2,238,000
Net income (loss)	(55,746,000)	(41,072,000)
Total stockholders' investment			1,250,790,000	1,294,232,000
Net cash provided by (used in) operating cash flow	(51,179,000)	(14,828,000)
Adjustments for New Accounting Pronouncement [Member]
Foreign Currency [abstract]
Increase (Decrease) in Accrued Taxes Payable	1,600,000
Net cash provided by (used in) operating cash flow		570,000
Air transportation equipment
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Capital expenditures	10,810,000	17,487,000
Gain (loss) on disposal of assets	2,263,000	132,000
Other Capitalized Property
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Capital expenditures	$ 1,743,000	$ 3,576,000
Medium aircraft
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Number of aircraft delivered | aircraft	3	0
Customer contracts
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets - beginning balance	$ 8,169,000
Foreign currency translation	0
Intangible assets - ending balance	8,169,000
Accumulated amortization of intangible assets - beginning balance	(8,155,000)
Amortization of Intangible Assets	(6,000)
Accumulated amortization of intangible assets - ending balance	$ (8,161,000)
Weighted average remaining contractual life, in years	1 month 6 days
Customer relationships
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets - beginning balance	$ 12,752,000
Foreign currency translation	13,000
Intangible assets - ending balance	12,765,000
Accumulated amortization of intangible assets - beginning balance	(11,071,000)
Amortization of Intangible Assets	(71,000)
Accumulated amortization of intangible assets - ending balance	$ (11,142,000)
Weighted average remaining contractual life, in years	3 years 7 months 6 days
Trade name and trademarks
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets - beginning balance	$ 4,483,000
Foreign currency translation	127,000
Intangible assets - ending balance	4,610,000
Accumulated amortization of intangible assets - beginning balance	(908,000)
Amortization of Intangible Assets	(71,000)
Accumulated amortization of intangible assets - ending balance	$ (979,000)
Weighted average remaining contractual life, in years	13 years 1 month 6 days
Internally developed software
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets - beginning balance	$ 1,062,000
Foreign currency translation	15,000
Intangible assets - ending balance	1,077,000
Accumulated amortization of intangible assets - beginning balance	(685,000)
Amortization of Intangible Assets	(53,000)
Accumulated amortization of intangible assets - ending balance	$ (738,000)
Weighted average remaining contractual life, in years	1 year 9 months 18 days
Licenses
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets - beginning balance	$ 746,000
Foreign currency translation	2,000
Intangible assets - ending balance	748,000
Accumulated amortization of intangible assets - beginning balance	(657,000)
Amortization of Intangible Assets	(14,000)
Accumulated amortization of intangible assets - ending balance	$ (671,000)
Weighted average remaining contractual life, in years	1 year 7 months 6 days
Europe Caspian
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Accelerated depreciation		$ 200,000
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated goodwill impairment	$ (33,883,000)		(33,883,000)	(33,883,000)
Accumulated goodwill impairment - beginning balance	(33,883,000)
Goodwill impairments	0
Accumulated goodwill impairment - ending balance	(33,883,000)
Foreign Currency [abstract]
Revenues	192,435,000	196,963,000
Africa
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Accelerated depreciation		2,800,000
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated goodwill impairment	(6,179,000)		(6,179,000)	(6,179,000)
Accumulated goodwill impairment - beginning balance	(6,179,000)
Goodwill impairments	0
Accumulated goodwill impairment - ending balance	(6,179,000)
Foreign Currency [abstract]
Revenues	50,790,000	54,262,000
Americas
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Accelerated depreciation		3,900,000
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated goodwill impairment	(576,000)		(576,000)	(576,000)
Accumulated goodwill impairment - beginning balance	(576,000)
Goodwill impairments	0
Accumulated goodwill impairment - ending balance	(576,000)
Foreign Currency [abstract]
Revenues	58,056,000	59,044,000
Asia Pacific
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	19,798,000		19,907,000	19,798,000
Goodwill - beginning balance	19,798,000
Goodwill foreign currency translation	109,000
Goodwill - ending balance	19,907,000
Foreign Currency [abstract]
Revenues	52,446,000	59,144,000
Corporate and other
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated goodwill impairment	(10,223,000)		(10,223,000)	$ (10,223,000)
Accumulated goodwill impairment - beginning balance	(10,223,000)
Goodwill impairments	0
Accumulated goodwill impairment - ending balance	(10,223,000)
Foreign Currency [abstract]
Revenues	1,734,000	$ 3,216,000
Nigeria
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Number Of Uncollectible Customer | Customer				2
Australia
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Number Of Uncollectible Customer | Customer				1
Affiliated Entity
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Allowance for doubtful accounts receivable, current			$ 0	$ 0
One British Pound Sterling Into Us Dollars | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		1.34	1.30
One British Pound Sterling Into Us Dollars | Maximum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		1.48	1.30
One British Pound Sterling Into Us Dollars | Weighted Average | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		1.43	1.28
One British Pound Sterling Into Us Dollars | Minimum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		1.31	1.24
One Euro Into Us Dollars | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		1.11	1.14
One Euro Into Us Dollars | Maximum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		1.15	1.14
One Euro Into Us Dollars | Weighted Average | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		1.13	1.10
One Euro Into Us Dollars | Minimum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		1.10	1.06
One Australian Dollar Into Us Dollars | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.74	0.77
One Australian Dollar Into Us Dollars | Maximum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.78	0.77
One Australian Dollar Into Us Dollars | Weighted Average | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.75	0.75
One Australian Dollar Into Us Dollars | Minimum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.72	0.74
One Norwegian Kroner Into Us Dollars | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.1195	0.1194
One Norwegian Kroner Into Us Dollars | Maximum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.1245	0.1199
One Norwegian Kroner Into Us Dollars | Weighted Average | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.1212	0.1174
One Norwegian Kroner Into Us Dollars | Minimum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.1163	0.1152
One Nigerian Naira Into Us Dollars | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.0035	0.0032
One Nigerian Naira Into Us Dollars | Maximum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.0050	0.0033
One Nigerian Naira Into Us Dollars | Weighted Average | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.0048	0.0032
One Nigerian Naira Into Us Dollars | Minimum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.0035	0.0032
One Brazilian Real Into Us Dollars | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.3121	0.3018
One Brazilian Real Into Us Dollars | Maximum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.3121	0.3233
One Brazilian Real Into Us Dollars | Weighted Average | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.2849	0.3113
One Brazilian Real Into Us Dollars | Minimum | Quarter To Date
Foreign Currency [abstract]
Foreign currency exchange rates		0.2702	0.2995
Impact of Changes in Foreign Currency Exchange Rates | Quarter To Date
Foreign Currency [abstract]
Revenues	(18,804,000)
Operating expense	13,710,000
Earnings from unconsolidated affiliates, net of losses	(1,090,000)
Non-operating expense	4,579,000
Income (loss) before provision for income taxes	(1,605,000)
Provision for income taxes	1,202,000
Net income (loss)	(403,000)
Cumulative translation adjustment	$ 10,070,000
Total stockholders' investment			$ 9,667,000
Commitments
Basis of Presentation, Consolidation and Summary of Significan Accounting Policies [Line Items]
Number Of Aircraft Delivered | aircraft	3