DEBT (Details) (USD $)	3 Months Ended	12 Months Ended														12 Months Ended			1 Months Ended		12 Months Ended		12 Months Ended			3 Months Ended	12 Months Ended					12 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011 Term Loan And Revolving Credit Facility [Member]	Mar. 31, 2012 Term Loan And Revolving Credit Facility [Member] First Amendment [Member]	Mar. 31, 2014 Term Loan And Revolving Credit Facility [Member] Third Amendment [Member]	Mar. 31, 2011 Credit Facility [Member]	Mar. 31, 2013 Credit Facility [Member] First Amendment [Member]	Mar. 31, 2012 Credit Facility [Member] First Amendment [Member]	Mar. 31, 2014 Credit Facility [Member] Second Amendment [Member]	Mar. 31, 2014 Credit Facility [Member] Third Amendment [Member]	Mar. 31, 2014 Letters Of Credit [Member]	Mar. 31, 2011 Letters Of Credit [Member]	Mar. 31, 2011 Five Year Term Loan [Member]	Mar. 31, 2012 Five Year Term Loan [Member] First Amendment [Member]	Mar. 31, 2014 Senior Notes Due 2022 [Member]	Mar. 31, 2013 Senior Notes Due 2022 [Member]	May 16, 2014 Senior Notes Due 2022 [Member] Subsequent Event [Member]	Jun. 30, 2014 Senior Notes Due 2022 [Member] Subsequent Event [Member]	Mar. 31, 2014 Term Loan [Member]	Mar. 31, 2013 Term Loan [Member]	Mar. 31, 2014 Convertible Senior Notes Due 2038 [Member]	Mar. 31, 2013 Convertible Senior Notes Due 2038 [Member]	Mar. 31, 2012 Convertible Senior Notes Due 2038 [Member]	Dec. 31, 2012 Senior Notes Due 2017 [Member]	Mar. 31, 2014 Senior Notes Due 2017 [Member]	Mar. 31, 2013 Senior Notes Due 2017 [Member]	Dec. 31, 2013 Senior Notes Due 2017 [Member]	Sep. 30, 2012 Senior Notes Due 2017 [Member]	Mar. 31, 2014 Senior Notes Due 2017 [Member] Debt Portion With Premium [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Mar. 31, 2013 Revolving Credit Facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member] Maximum [Member]	Mar. 31, 2014 Revolving Credit Facility [Member] Minimum [Member]	Mar. 31, 2014 Eastern Airways	Mar. 31, 2013 Eastern Airways	Mar. 31, 2014 Eastern Airways Maximum [Member]	Mar. 31, 2014 Eastern Airways Minimum [Member]	Mar. 31, 2014 Other Debt [Member]	Mar. 31, 2013 Other Debt [Member]	Mar. 31, 2014 Three Hundred Sixty Four Day Term Loan And Credit Facility [Member]	Mar. 31, 2013 Three Hundred Sixty Four Day Term Loan And Credit Facility [Member]
Debt Instrument [Line Items]
Total debt		$ 841,302,000	$ 787,269,000														$ 450,000,000	$ 450,000,000			$ 226,604,000	$ 230,625,000	$ 109,904,000	$ 106,196,000								$ 24,000,000	$ 0			$ 29,911,000	$ 0			$ 883,000	$ 448,000
Less short-term borrowings and current maturities of long-term debt		(14,207,000)	(22,323,000)
Total long-term debt		827,095,000	764,946,000
Debt Instrument, Interest Rate, Stated Percentage																	6.25%	6.25%					3.00%				7.50%	7.50%
Debt Instrument, Convertible, Conversion Price																							$ 74.05
Senior Notes Due 2022 [Abstract]
Debt Instrument Issuance Date																							Jun. 15, 2008																			Oct. 01, 2012
Debt instrument, priority																	The 6 ¼% Senior Notes are unsecured senior obligations and rank effectively junior in right of payment to all our existing and future secured indebtedness, rank equal in right of payment with our existing and future senior unsecured indebtedness and rank senior in right of payment to any of our existing and future subordinated indebtedness. The 6 ¼% Senior Notes are jointly and severally guaranteed on a senior unsecured basis by certain of our U.S. subsidiaries (the “Guarantor Subsidiaries”).
Debt Instrument, Face Amount					375,000,000			175,000,000	200,000,000	200,000,000	350,000,000	350,000,000		30,000,000	200,000,000	250,000,000	450,000,000										350,000,000				50,000,000											225,000,000
Debt instrument, restrictive covenants																	The indenture for the 6 ¼% Senior Notes includes restrictive covenants which limit, among other things, our ability to incur additional debt, issue disqualified stock, pay dividends, repurchase stock, invest in other entities, sell assets, incur additional liens or security, merge or consolidate the Company and enter into transactions with affiliates.
Debt instrument payment terms																	Interest on the 6 ¼% Senior Notes is payable on April 15 and October 15 of each year						Interest is paid on the 3% Convertible Senior Notes on June 15 and December 15 of each year.
Debt Instrument Maturity Date					Nov. 30, 2015	Dec. 31, 2016	Apr. 30, 2018										Oct. 15, 2022						Jun. 15, 2038																				Sep. 30, 2013
Date of First Required Payment						Dec. 30, 2011											Apr. 15, 2013
Prepayment premium description																	We may redeem any of the 6 ¼% Senior Notes at any time on or after October 15, 2017, in whole or part, in cash, at certain redemption prices plus accrued and unpaid interest, if any, to the date of redemption. At any time prior to October 15, 2015, we may redeem up to 35% of the aggregate principal amount of the 6 ¼% Senior Notes issued under the indenture with the net proceeds of certain equity offerings at a redemption price equal to 106.25% of the principal amount of the 6 ¼% Senior Notes plus accrued and unpaid interest, if any, to the date of redemption. We may make that redemption only if, after the redemption, at least 65% of the aggregate principal amount of the 6 ¼% Senior Notes issued under the indenture remains outstanding. In addition, at any time prior to October 15, 2017, we may redeem all, but not less than all, of the 6 ¼% Senior Notes at a redemption price equal to the principal amount plus an applicable premium and accrued and unpaid interest, if any, to the redemption date.
Debt Issuance Costs																		7,400,000																									2,900,000
Term Loan And Revolving Credit Facility [Abstract]
Proceeds from borrowings		533,064,000	675,449,000	159,993,000												50,000,000																528,600,000								3,600,000	500,000
Debt instrument balloon payment																133,800,000
Base rate description																																As amended by the First Amendment, borrowings under the Revolving Credit Facility bear interest at an interest rate equal to, at our option, either the Base Rate or LIBOR (or EURIBO, in the case of Euro-denominated borrowings) plus the applicable margin. “Base Rate” means the higher of (1) the prime rate and (2) the Federal Funds rate plus 0.50% per annum. The applicable margin for borrowings ranges from 0% to 2.25%, depending on whether the Base Rate or LIBOR is used, and is determined based on our leverage ratio pricing grid.										“Base Rate” means the higher of (1) the per annum rate the administrative agent publicly announces as its prime lending rate in effect from time to time and (2) the Federal Funds rate plus 0.50% per annum. The applicable margin ranged from 0.00% to 2.25%, depending on whether the Base Rate or LIBOR was used, and was determined based on our leverage ratio pricing grid
Margin rate																																		2.25%	0.00%			3.50%	2.50%
Percentage of fees paid on unused credit facility																																In addition, we are required to pay fees on the daily unused amount of the Revolving Credit Facility in an amount per annum equal to an applicable percentage, which ranges from 0.25% to 0.50% and is determined based on our leverage ratio pricing grid.
Debt Instrument, Interest Rate at Period End																																1.91%	2.21%					5.00%	3.60%	11.80%
Percentage Of Domestic Capital Stock Guarantee		100.00%
Percentage Of Foreign Capital Stock Guarantee		65.00%
Repayment of debt																					3,500,000											504,600,000								3,100,000			225,000,000
Letters of Credit Outstanding, Amount													500,000
Conversion Feature [Abstract]
Debt Instrument Convertible Terms Of Conversion Feature		As of March 31, 2014, the base conversion price of the notes was approximately $74.05, based on the base conversion rate of 13.5048 shares of Common Stock per $1,000 principal amount of convertible notes (subject to adjustment in certain circumstances, including the payment of dividends). In general, upon conversion of a note, the holder will receive cash equal to the principal amount of the note and Common Stock to the extent of the note’s conversion value in excess of such principal amount. In addition, if at the time of conversion the applicable price of our Common Stock exceeds the base conversion price, holders will receive up to an additional 8.7781 shares of our Common Stock per $1,000 principal amount of notes, as determined pursuant to a specified formula.																					As of March 31, 2014, the base conversion price of the notes was approximately $74.05, based on the base conversion rate of 13.5048 shares of Common Stock per $1,000 principal amount of convertible notes (subject to adjustment in certain circumstances, including the payment of dividends). In general, upon conversion of a note, the holder will receive cash equal to the principal amount of the note and Common Stock to the extent of the note’s conversion value in excess of such principal amount. In addition, if at the time of conversion the applicable price of our Common Stock exceeds the base conversion price, holders will receive up to an additional 8.7781 shares of our Common Stock per $1,000 principal amount of notes, as determined pursuant to a specified formula.
Debt Instrument, Convertible, Conversion Ratio																							13.5048
Balances Of Debt And Equity Components [Abstract]
Equity component- net carrying value																							14,905,000	14,905,000
Debt Instrument, Face Amount Without Premium																							115,000,000	115,000,000
Debt component- unamortized discount																							(5,096,000)	(8,804,000)
Debt component- net carrying value																							109,904,000	106,196,000
Debt Instrument, Call Date, Earliest																							Jun. 15, 2015
Debt Instrument, Call Feature																							The notes will mature on June 15, 2038 and may not be redeemed by us prior to June 15, 2015, after which they may be redeemed at 100% of principal amount plus accrued and unpaid interest. Holders of the 3% Convertible Senior Notes may require us to repurchase any or all of their notes for cash on June 15, 2015, 2020, 2025, 2030 and 2035, or in the event of a fundamental change, as defined in the indenture for the 3% Convertible Senior Notes (including the delisting of our Common Stock and certain change of control transactions), at a price equal to 100% of the principal amount plus accrued and unpaid interest. If a holder elects to convert its notes in connection with certain fundamental changes occurring prior to June 15, 2015, we will increase the applicable conversion rate by a specified number of additional shares of Common Stock.
Long Term Convertible Debt Current And Noncurrent [Abstract]
Debt Instrument Effective Interest Rate																							6.90%	6.90%	6.90%
Contractual coupon interest																							3,450,000	3,450,000	3,450,000
Amortization of debt discount		3,708,000	3,597,000	3,380,000																			3,708,000	3,597,000	3,380,000
Total interest expense																							7,158,000	7,047,000	6,830,000
Senior Notes [Abstract]
Debt Instrument, Face Amount Without Premium																							115,000,000	115,000,000
Premium, Face Amount																											600,000
Tender offer date		2012-09-25T00:00:00
Tender offer amount																												350,000,000
Tender offer consideration rate																											$1,041.50 per $1,000 principal amount
Debt Instrument, Repurchase Amount																				11,300,000									11,900,000	338,100,000
Redemption premium rate																			107.75%							1.0375%
Total consideration paid																				12,200,000										352,000,000
Extinguishment of debt		0	14,932,000	0
Unamortized debt issuance expense		11,400,000	11,200,000
Annual Maturities [Abstract]
Year 2015		14,207,000
Year 2016		16,721,000
Year 2017		25,176,000
Year 2018		26,623,000
Year 2019		30,191,000
Thereafter		734,042,000
Long-term Debt, Gross		846,960,000
Debt Instrument, Term																																						10 years	2 years
Proceeds from borrowings		533,064,000	675,449,000	159,993,000												50,000,000																528,600,000								3,600,000	500,000
Write off of deferred debt issuance cost	2,600,000	12,733,000	4,642,000	0																								2,600,000															2,100,000
Interest Paid		38,400,000	25,900,000	37,800,000
Capitalized Interest		$ 14,100,000	$ 6,600,000	$ 5,000,000