BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014
Foreign Currency [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ (400,000)	$ (1,400,000)
Revenues	472,538,000	398,994,000
Operating expense	(412,237,000)	(355,126,000)
Earnings from unconsolidated affiliates, net of losses	4,281,000	13,972,000
Income before provision for income taxes	56,826,000	34,502,000
Provision for income taxes	(11,823,000)	(7,590,000)
Net income	45,003,000	26,912,000
Total stockholders' investment	1,783,387,000		1,756,586,000
Impact of Foreign Exchange Rates on Unconsolidated affiliates	400,000	(400,000)
Interest income	200,000	100,000
Interest and Debt Expense	7,400,000	20,400,000
Debt Instrument, Repurchase Amount	11,300,000
Write-off of deferred debt financing fees	164,000	12,733,000
Accounts Receivable [Line Items]
Allowance for doubtful accounts, affiliates	0		0
Allowance For Doubtful Accounts Non-Affiliates	400,000		5,000,000
Allowance for Doubtful Accounts Receivable, Recoveries	4,400,000
Allowance for Doubtful Accounts Receivable, Write-offs	500,000
Inventories [Line Items]
Inventory allowance	47,300,000		46,000,000
Additional allowances		800,000
Prepaid expenses and other current assets	54,787,000		53,084,000
Property And Equipment [Line Items]
Number of aircraft delivered	9	6
Capital expenditures	200,447,000	179,532,000
Payments for PP&E	161,000,000	161,600,000
Impairment of Long-Lived Assets to be Disposed of	(2,579,000)	(2,055,000)
Number of Impairment of Long-Lived Assets to be Disposed of	4	2
Property, Plant and Equipment, Number of Aircraft Sold	4	4
Proceeds from asset dispositions	6,643,000	1,893,000
Net gain/loss from aircraft and other equipment sold	3,189,000	(491,000)
Deferred sale leaseback advance total	167,100,000		166,300,000
Deferred sale leaseback advance - current	152,347,000		136,930,000
Deferred sale leaseback advance - long-term	14,800,000		29,400,000
Proceeds from Assignment of Aircraft Purchase Agreement			106,100,000
Number of aircraft assigned future payments			7
Deferred sale leaseback progress payments	60,200,000
Service Life [Member]
Property And Equipment [Line Items]
Change in Accounting Estimate, Financial Effect	$1.0 million reduction in depreciation expense
U.K. SAR [Member]
Foreign Currency [Line Items]
Write-off of deferred debt financing fees	12,700,000
U.K. SAR and Norway Client [Member]
Inventories [Line Items]
Prepaid expenses and other current assets	8,300,000		5,500,000
Deferred Contract Acquisition Cost, Non Current	18,400,000		15,200,000
Air Transportation Equipment [Member]
Property And Equipment [Line Items]
Capital expenditures	172,098,000	167,227,000
Other Capitalized Property
Property And Equipment [Line Items]
Capital expenditures	28,349,000	12,305,000
Medium Aircraft [Member]
Property And Equipment [Line Items]
Number of aircraft delivered	3	3
Large Aircraft [Member]
Property And Equipment [Line Items]
Number of aircraft delivered	6	3
Senior Notes Due 2022 [Member]
Foreign Currency [Line Items]
Debt Instrument, Repurchase Amount	11,300,000
Other income (expense)	900,000
Write-off of deferred debt financing fees	200,000
Assets Held-for-sale [Member]
Property And Equipment [Line Items]
Impairment of Long-Lived Assets to be Disposed of	(2,579,000)	(1,230,000)
One British Pound Sterling Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency period end exchange rates	1.71	1.52
One British Pound Sterling Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.71	1.57
One British Pound Sterling Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.66	1.50
One British Pound Sterling Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.68	1.54
One Euro Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency period end exchange rates	1.37	1.30
One Euro Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.39	1.34
One Euro Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.35	1.28
One Euro Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	1.37	1.31
One Australian Dollar Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency period end exchange rates	0.94	0.92
One Australian Dollar Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.94	1.07
One Australian Dollar Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.92	0.92
One Australian Dollar Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.93	1.00
One Nigerian Naira Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency period end exchange rates	0.0062	0.0062
One Nigerian Naira Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.0063	0.0065
One Nigerian Naira Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.0061	0.0062
One Nigerian Naira Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.0062	0.0064
One Brazilian Real Into Us Dollars [Member]
Foreign Currency [Line Items]
Foreign currency period end exchange rates	0.4538	0.4492
One Brazilian Real Into Us Dollars [Member] | Maximum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.4572	0.5123
One Brazilian Real Into Us Dollars [Member] | Minimum [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.4391	0.4434
One Brazilian Real Into Us Dollars [Member] | Weighted Average [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates	0.4493	0.4857
Impact of Changes in Foreign Currency Exchange Rates [Member]
Foreign Currency [Line Items]
Revenues	10,345,000
Operating expense	(6,082,000)
Earnings from unconsolidated affiliates, net of losses	722,000
Non-operating expense	949,000
Income before provision for income taxes	5,934,000
Provision for income taxes	(1,365,000)
Net income	4,569,000
Cumulative translation adjustment	9,208,000
Total stockholders' investment	$ 13,777,000