STOCKHOLDERS' INVESTMENT, EARNINGS PER SHARE AND ACCUMULATED COMPREHENSIVE INCOME (Details) - USD ($)	3 Months Ended													12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	May. 20, 2016	Jul. 13, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Common Stock shares reserved		3,950,524												3,950,524
Common stock, shares outstanding, beginning balance	34,976,743				34,838,374				35,708,469					34,838,374	35,708,469
Exercise of stock options														0	114,145
Issuance of restricted stock														138,369	176,609
Repurchases of common stock															(1,160,940)	(1,043,875)
Other Issuance of Common Stock															91
Common stock, shares outstanding, ending balance		34,976,743				34,838,374				35,708,469				34,976,743	34,838,374	35,708,469
Weighted average exercise price of options exercised														$ 0.00	$ 45.31
Weighted average price per share of issued restricted stock and restricted stock units														$ 45.69	73.73
Weighted average price per share of treasury stock purchased						$ 69.63									69.63
Weighted average price per share of other issuances						67.47									67.47
Percentage of stock owned by U.S. citizens requirement														75.00%
Percentage of stock owned by other than U.S. citizens requirement														25.00%
Common shares owned by foreign addresses		1,512,000												1,512,000
Percentage of total outstanding common shares owned by foreign addresses														4.00%
Cash dividends declared per common share		$ 0.07	$ 0.34	$ 0.34	$ 0.34	0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 1.09	$ 1.28	$ 1.00
Repurchases of common stock, shares															1,160,940	1,043,875
Dividends paid														$ 38,076,000	$ 45,078,000	$ 36,320,000
Repurchase of Common Stock														0	80,831,000	77,661,000
Income (loss) available to common stockholders – basic														(73,940,000)	84,300,000	186,737,000
Interest expense on assumed conversion of 3% Convertible Senior Notes, net of tax														0	0	0
Income (loss) available to common stockholders - diluted														$ (73,940,000)	$ 84,300,000	$ 186,737,000
Weighted average number of common shares outstanding - basic														34,893,844	35,193,480	36,283,853
Assumed conversion of 3% Convertible Senior Noted outstanding during the period														0	0	0
Net effect of dilutive stock options, restricted stock units and restricted stock awards based on the treasury stock method														0	335,125	412,911
Weighted average number of common shares outstanding - diluted														34,893,844	35,528,605	36,696,764
Basic earnings (loss) per share		(0.72)	0.09	(1.21)	(0.27)	0.43	(0.03)	0.74	1.24					$ (2.12)	$ 2.40	$ 5.15
Diluted earnings (loss) per share		$ (0.72)	$ 0.09	$ (1.21)	$ (0.27)	$ 0.43	$ (0.03)	$ 0.73	$ 1.23					$ (2.12)	$ 2.37	$ 5.09
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive loss, beginning balance	$ (289,819,000)				$ (270,329,000)				$ (156,506,000)				$ (199,683,000)	$ (270,329,000)	$ (156,506,000)	$ (199,683,000)
Other comprehensive income before reclassification														(25,778,000)	(119,146,000)	36,873,000
Reclassification from accumulated other comprehensive income														6,288,000	5,323,000	6,304,000
Net current period other comprehensive income														(19,490,000)	(113,823,000)	43,177,000
Accumulated other comprehensive income, foreign exchange rate impact		$ 0				$ 0				$ 0				0	0	0
Accumulated other comprehensive loss, ending balance		(289,819,000)				(270,329,000)				(156,506,000)				(289,819,000)	(270,329,000)	(156,506,000)
Currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive loss, beginning balance	(67,365,000)				(39,066,000)				57,812,000				14,689,000	(39,066,000)	57,812,000	14,689,000
Other comprehensive income before reclassification														(20,195,000)	(76,845,000)	19,810,000
Reclassification from accumulated other comprehensive income														0	0	0
Net current period other comprehensive income														(20,195,000)	(76,845,000)	19,810,000
Accumulated other comprehensive income, foreign exchange rate impact		(8,104,000)				(20,033,000)				23,313,000				(8,104,000)	(20,033,000)	23,313,000
Accumulated other comprehensive loss, ending balance		(67,365,000)				(39,066,000)				57,812,000				(67,365,000)	(39,066,000)	57,812,000
Pension liability adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive loss, beginning balance	$ (222,454,000)				(231,263,000)				$ (214,318,000)				$ (214,372,000)	(231,263,000)	(214,318,000)	(214,372,000)
Other comprehensive income before reclassification														(5,583,000)	(42,301,000)	17,063,000
Reclassification from accumulated other comprehensive income														6,288,000	5,323,000	6,304,000
Net current period other comprehensive income														705,000	(36,978,000)	23,367,000
Accumulated other comprehensive income, foreign exchange rate impact		8,104,000				20,033,000				(23,313,000)				8,104,000	20,033,000	(23,313,000)
Accumulated other comprehensive loss, ending balance		(222,454,000)				$ (231,263,000)				$ (214,318,000)				(222,454,000)	$ (231,263,000)	$ (214,318,000)
Convertible Notes Payable
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Debt instrument, repurchase amount		$ 115,000,000			$ 113,100,000									115,000,000				$ 1,900,000
Per principal amount of convertible debt														$ 1,000
Subsequent event
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Cash dividends declared per common share	$ 0.07
Stock repurchase program, remaining authorized repurchase amount																	$ 150,000,000
Stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding														1,194,783	682,800	297,595
Weighted average exercise price		$ 62.11				$ 69.04				$ 43.59				$ 62.11	$ 69.04	$ 43.59
Restricted stock awards
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding														286,804	0	7,416
Weighted average exercise price		$ 37.27				$ 0.00				$ 70.90				$ 37.27	$ 0.00	$ 70.90