BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended			3 Months Ended		6 Months Ended																																																																																		3 Months Ended	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Sep. 30, 2013 FB Entities [Member]	Sep. 30, 2013 FB Entities [Member]	Sep. 30, 2013 U.K. SAR [Member]	Mar. 31, 2013 U.K. SAR [Member]	Sep. 30, 2013 Air Transportation Equipment [Member]	Sep. 30, 2012 Air Transportation Equipment [Member]	Sep. 30, 2013 Air Transportation Equipment [Member]	Sep. 30, 2012 Air Transportation Equipment [Member]	Sep. 30, 2013 Other Capitalized Property	Sep. 30, 2012 Other Capitalized Property	Sep. 30, 2013 Other Capitalized Property	Sep. 30, 2012 Other Capitalized Property	Sep. 30, 2013 Medium Aircraft [Member]	Sep. 30, 2012 Medium Aircraft [Member]	Sep. 30, 2013 Medium Aircraft [Member]	Sep. 30, 2012 Medium Aircraft [Member]	Sep. 30, 2013 Large Aircraft [Member]	Sep. 30, 2012 Large Aircraft [Member]	Sep. 30, 2013 Large Aircraft [Member]	Sep. 30, 2012 Large Aircraft [Member]	Mar. 31, 2013 Search And Rescue [Member]	Sep. 30, 2013 Revolving Credit Facility [Member] First Amendment [Member]	Sep. 30, 2013 Revolving Credit Facility [Member] Third Amendment [Member]	Sep. 30, 2013 Assets Held-for-sale [Member]	Sep. 30, 2012 Assets Held-for-sale [Member]	Sep. 30, 2013 Assets Held-for-sale [Member]	Sep. 30, 2012 Assets Held-for-sale [Member]	Sep. 30, 2013 One British Pound Sterling Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2012 One British Pound Sterling Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2013 One British Pound Sterling Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2012 One British Pound Sterling Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2013 One British Pound Sterling Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2012 One British Pound Sterling Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2013 One British Pound Sterling Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2012 One British Pound Sterling Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2013 One British Pound Sterling Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2012 One British Pound Sterling Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2013 One British Pound Sterling Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2012 One British Pound Sterling Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2013 One British Pound Sterling Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2012 One British Pound Sterling Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2013 One British Pound Sterling Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2012 One British Pound Sterling Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2013 One Euro Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2012 One Euro Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2013 One Euro Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2012 One Euro Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2013 One Euro Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2012 One Euro Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2013 One Euro Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2012 One Euro Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2013 One Euro Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2012 One Euro Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2013 One Euro Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2012 One Euro Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2013 One Euro Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2012 One Euro Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2013 One Euro Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2012 One Euro Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2013 One Australian Dollar Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2012 One Australian Dollar Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2013 One Australian Dollar Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2012 One Australian Dollar Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2013 One Australian Dollar Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2012 One Australian Dollar Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2013 One Australian Dollar Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2012 One Australian Dollar Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2013 One Australian Dollar Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2012 One Australian Dollar Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2013 One Australian Dollar Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2012 One Australian Dollar Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2013 One Australian Dollar Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2012 One Australian Dollar Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2013 One Australian Dollar Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2012 One Australian Dollar Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2013 One Nigerian Naira Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2012 One Nigerian Naira Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2013 One Nigerian Naira Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2012 One Nigerian Naira Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2013 One Nigerian Naira Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2012 One Nigerian Naira Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2013 One Nigerian Naira Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2012 One Nigerian Naira Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2013 One Nigerian Naira Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2012 One Nigerian Naira Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2013 One Nigerian Naira Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2012 One Nigerian Naira Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2013 One Nigerian Naira Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2012 One Nigerian Naira Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2013 One Nigerian Naira Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2012 One Nigerian Naira Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2013 One Brazilian Real Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2012 One Brazilian Real Into Us Dollars [Member] High [Member] Quarter To Date [Member]	Sep. 30, 2013 One Brazilian Real Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2012 One Brazilian Real Into Us Dollars [Member] High [Member] Year To Date [Member]	Sep. 30, 2013 One Brazilian Real Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2012 One Brazilian Real Into Us Dollars [Member] Average [Member] Quarter To Date [Member]	Sep. 30, 2013 One Brazilian Real Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2012 One Brazilian Real Into Us Dollars [Member] Average [Member] Year To Date [Member]	Sep. 30, 2013 One Brazilian Real Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2012 One Brazilian Real Into Us Dollars [Member] Low [Member] Quarter To Date [Member]	Sep. 30, 2013 One Brazilian Real Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2012 One Brazilian Real Into Us Dollars [Member] Low [Member] Year To Date [Member]	Sep. 30, 2013 One Brazilian Real Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2012 One Brazilian Real Into Us Dollars [Member] At period-end [Member] Quarter To Date [Member]	Sep. 30, 2013 One Brazilian Real Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2012 One Brazilian Real Into Us Dollars [Member] At period-end [Member] Year To Date [Member]	Sep. 30, 2013 Impact of Changes in Foreign Currency Exchange Rates [Member] Quarter To Date [Member]	Sep. 30, 2013 Impact of Changes in Foreign Currency Exchange Rates [Member] Year To Date [Member]
Foreign Currency [Line Items]
Foreign currency exchange rates																																	1.62	1.63	1.62	1.63	1.55	1.58	1.54	1.58	1.48	1.54	1.48	1.53	1.62	1.61	1.62	1.61	1.35	1.31	1.35	1.33	1.32	1.25	1.32	1.27	1.28	1.21	1.26	1.21	1.35	1.29	1.35	1.29	0.95	1.06	1.07	1.06	0.92	1.04	0.95	1.03	0.89	1.01	0.89	0.97	0.94	1.04	0.94	1.04	0.0064	0.0065	0.0065	0.0065	0.0063	0.0063	0.0063	0.0063	0.0061	0.0062	0.0061	0.0061	0.0063	0.0064	0.0063	0.0064	0.4568	0.5029	0.5123	0.5488	0.4380	0.4941	0.4617	0.5033	0.4093	0.4879	0.4093	0.4811	0.4475	0.4944	0.4475	0.4944
Foreign Currency Transaction Gain (Loss), before Tax	$ 400,000	$ (200,000)	$ (1,000,000)	$ (1,100,000)
Revenues	417,328,000	365,754,000	816,322,000	728,362,000																																																																																																													(6,874,000)	(9,862,000)
Operating expense	(363,417,000)	(324,158,000)	(718,543,000)	(643,447,000)																																																																																																													4,858,000	6,531,000
Earnings from unconsolidated affiliates, net of losses	3,088,000	6,994,000	17,060,000	8,983,000																																																																																																													(1,868,000)	1,330,000
Non-operating expense																																																																																																																	615,000	273,000
Income before provision for income taxes	151,030,000	38,776,000	185,532,000	69,152,000																																																																																																													(3,269,000)	(1,728,000)
Provision for income taxes	(41,146,000)	(8,342,000)	(48,736,000)	(14,522,000)		(36,000,000)	(36,000,000)																																																																																																										719,000	380,000
Net income	109,884,000	30,434,000	136,796,000	54,630,000																																																																																																													(2,550,000)	(1,348,000)
Cumulative translation adjustment																																																																																																																	15,766,000	11,207,000
Total stockholders' investment	1,760,479,000		1,760,479,000		1,610,957,000																																																																																																												13,216,000	9,859,000
Impact of Foreign Exchange Rates on Unconsolidated affiliates	(2,100,000)	(200,000)	(2,400,000)	(3,800,000)
Other income (expense)						1,100,000	1,100,000
Accounts Receivable [Line Items]
Allowance for doubtful accounts, affiliates	0		0		0
Allowance For Doubtful Accounts Non-Affiliates	5,000,000		5,000,000		5,100,000
Contract acquisition cost								15,400,000	10,800,000
Property And Equipment [Line Items]
Impairment of Long-Lived Assets to be Disposed of																													(950,000)	(2,000,000)	(2,180,000)	(3,889,000)
Number of Impairment of Long-Lived Assets to be Disposed of																													1	2	3	9
Property, Plant and Equipment, Number of Aircraft Sold	11	6	15	10
Proceeds from Sale of Flight Equipment	153,710,000	76,149,000	155,603,000	96,376,000
Net gain/loss from aircraft and other equipment sold	(2,114,000)	738,000	(2,605,000)	(2,688,000)
Number Of Aircraft Delivered	5	0	10	3														3	0	5	0	2	0	5	3
Capital expenditures	160,027,000	26,850,000	339,559,000	113,405,000						145,653,000	14,887,000	312,880,000	94,856,000	14,374,000	11,963,000	26,679,000	18,549,000
Sale Leaseback Transaction, Gross Proceeds	145,600,000	50,400,000	145,600,000	50,400,000
Sale Leaseback Transaction, Description of Asset(s)	7	2	7	2
Inventories [Line Items]
Impairment of inventories	1,500,000		2,400,000
Deferred financing fees																										12,700,000
Debt Instrument, Face Amount																											$ 200,000,000	$ 350,000,000