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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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FAIR VALUE DISCLOSURES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015 aircraft	Mar. 31, 2014 aircraft	Mar. 31, 2013	Jan. 29, 2015
Fair Value [Line Items]
Inventories	$ 147,169us-gaap_InventoryNet	$ 137,463us-gaap_InventoryNet
Assets held for sale	57,827	29,276
Inventory Write-down	(7,167)us-gaap_InventoryWriteDown	(12,669)us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown
Impairment charges on assets held for sale	(36,057)	(6,814)
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(43,224)	(19,483)
Other accrued liabilities	82,605us-gaap_OtherLiabilitiesCurrent	45,853us-gaap_OtherLiabilitiesCurrent
Other liabilities and deferred credits	39,782us-gaap_OtherLiabilitiesNoncurrent	78,126us-gaap_OtherLiabilitiesNoncurrent
Contingent consideration	38,905	31,322
Number of aircraft impaired	27	11
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value starting balance	31,322
Change in fair value of contingent consideration	1,177
Earn out payment	6,406
Fair value ending balance	38,905	31,322
Carrying value of total debt	864,422	841,302
Fair value of total debt	845,524us-gaap_DebtInstrumentFairValue	900,780us-gaap_DebtInstrumentFairValue
Airnorth [Member]
Fair Value [Line Items]
Contingent consideration	6,400
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value ending balance	6,400
Cougar [Member]
Fair Value [Line Items]
Contingent consideration	32,500	31,300
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value ending balance	32,500	31,300
Assets Held For Sale [Member]
Fair Value [Line Items]
Impairment charges on assets held for sale	(36,057)	(6,814)	(4,362)
Number of aircraft impaired	27	11	10
Senior Notes [Member] \| Senior Notes Due 2022 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value of total debt	401,535	450,000
Fair value of total debt	381,458	477,000
Term Loan [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value of total debt	222,179	226,604
Fair value of total debt	222,179	226,604
Convertible Notes Payable [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value of total debt	114,109	109,904
Fair value of total debt	115,288	142,382
Revolving Credit Facility [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value of total debt	83,800	24,000
Fair value of total debt	83,800	24,000
Other Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value of total debt	0	883
Fair value of total debt	0	883
Other Debt [Member] \| Airnorth [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value of total debt	23,119	0
Fair value of total debt	23,119	0
Other Debt [Member] \| Eastern Airways
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value of total debt	19,680	29,911
Fair value of total debt	19,680	29,911
Fair Value Measurements Nonrecurring [Member]
Fair Value [Line Items]
Inventories	3,139	50,505
Assets held for sale	54,310	16,050
Total assets	57,449	66,555
Fair Value, Measurements, Recurring [Member]
Fair Value [Line Items]
Rabbi Trust investments	2,379	6,599
Total assets	2,379	6,599
Other accrued liabilities	33,938	7,652
Other liabilities and deferred credits	4,967	23,670
Total liabilities recurring	38,905	31,322
Fair Value, Inputs, Level 1 [Member] \| Fair Value Measurements Nonrecurring [Member]
Fair Value [Line Items]
Inventories	0	0
Assets held for sale	0	0
Total assets	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value [Line Items]
Rabbi Trust investments	2,379	6,599
Total assets	2,379	6,599
Other accrued liabilities	0	0
Other liabilities and deferred credits	0	0
Total liabilities recurring	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value Measurements Nonrecurring [Member]
Fair Value [Line Items]
Inventories	3,139	50,505
Assets held for sale	54,310	16,050
Total assets	57,449	66,555
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value [Line Items]
Rabbi Trust investments	0	0
Total assets	0	0
Other accrued liabilities	0	0
Other liabilities and deferred credits	0	0
Total liabilities recurring	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value Measurements Nonrecurring [Member]
Fair Value [Line Items]
Inventories	0	0
Assets held for sale	0	0
Total assets	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value [Line Items]
Rabbi Trust investments	0	0
Total assets	0	0
Other accrued liabilities	33,938	7,652
Other liabilities and deferred credits	4,967	23,670
Total liabilities recurring	38,905	31,322
Cougar [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Inputs, Discount Rate	4.00%	4.00%
Airnorth [Member]
Fair Value [Line Items]
Other liabilities and deferred credits				$ 9,441
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Inputs, Discount Rate	2.00%