DEBT (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 818,188,000		$ 818,188,000		$ 841,302,000
Less short-term borrowings and current maturities of long-term debt	(14,277,000)		(14,277,000)		(14,207,000)
Total long-term debt	803,911,000		803,911,000		827,095,000
Write-off of deferred debt financing fees			660,000	12,733,000
Proceeds from borrowings			347,860,000	283,977,000
Letters of Credit Outstanding, Amount	500,000		500,000
Long Term Convertible Debt Current And Noncurrent [Abstract]
Amortization of debt discount			3,212,000	2,719,000
Senior Notes [Member] | Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total debt	401,535,000		401,535,000		450,000,000
Other income (expense)	(700,000)		(2,600,000)
Write-off of deferred debt financing fees	200,000		660,000
Debt Instrument, Interest Rate, Stated Percentage	6.25%		6.25%
Senior Notes [Member] | Senior Notes Due 2022 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Repurchase premium rate	104.25%		107.75%
Senior Notes [Member] | Senior Notes Due 2022 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Repurchase premium rate	103.75%		103.75%
Senior Notes [Member] | Senior Notes Due 2022 [Member] | Quarter To Date [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	17,200,000		17,200,000
Total consideration paid	18,300,000		18,300,000
Senior Notes [Member] | Senior Notes Due 2022 [Member] | Year To Date [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	48,500,000		48,500,000
Total consideration paid	52,000,000		52,000,000
Senior Notes [Member] | Convertible Senior Notes Due 2038 [Member]
Debt Instrument [Line Items]
Total debt	113,025,000		113,025,000		109,904,000
Debt Instrument, Interest Rate, Stated Percentage	3.00%		3.00%
Long Term Convertible Debt Current And Noncurrent [Abstract]
Equity component- net carrying value	14,905,000		14,905,000		14,905,000
Debt Instrument, Face Amount	115,000,000		115,000,000		115,000,000
Debt component- unamortized discount	(1,975,000)		(1,975,000)		(5,096,000)
Debt Instrument, Convertible, Effective Interest Rate	6.90%		6.90%
Contractual coupon interest	862,000	862,000	2,588,000	2,588,000
Amortization of debt discount	1,054,000	985,000	3,121,000	2,695,000
Total interest expense	1,916,000	1,847,000	5,709,000	5,283,000
Term Loan [Member]
Debt Instrument [Line Items]
Total debt	223,288,000		223,288,000		226,604,000
Repayment of debt			3,400,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	58,500,000		58,500,000		24,000,000
Proceeds from borrowings			346,500,000
Repayment of debt			312,000,000
Eastern Airways [Member]
Debt Instrument [Line Items]
Total debt	21,840,000		21,840,000		29,911,000
Other debt [Member]
Debt Instrument [Line Items]
Total debt	$ 0		$ 0		$ 883,000