STOCKHOLDERS' INVESTMENT, EARNINGS PER SHARE AND ACCUMULATED COMPREHENSIVE INCOME (Details) (USD $)	3 Months Ended												12 Months Ended			3 Months Ended
	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, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2015	Nov. 06, 2014	May 15, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Common Stock Shares reserved	4,133,008												4,133,008
Common stock, shares outstanding, beginning balance				35,708,469				36,150,639				35,755,317	35,708,469	36,150,639	35,755,317
Exercise of stock options													114,145	433,608
Issuance of restricted stock and restricted stock units													176,609	167,797
Repurchases of common stock, shares													(1,160,940)	(1,043,875)	(24,709)
Other Issuance of Common Stock													91	300
Common stock, shares outstanding, ending balance	34,838,374				35,708,469				36,150,639				34,838,374	35,708,469	36,150,639
Weighted average exercise price of options exercised													$ 45.31	$ 35.51
Weighted average price per share of issued restricted stock and restricted stock units													$ 73.73	$ 67.27
Weighted average price per share of treasury stock purchased	$ 69.63				$ 74.40								$ 69.63	$ 74.40
Weighted average price per share of other issuances	$ 67.47				$ 65.90								$ 67.47	$ 65.90
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	2,752,000												2,752,000
Percentage of total outstanding common shares owned by foreign addresses													8.00%
Cash dividends declared per common share	$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.20	$ 0.2	$ 0.2	$ 0.2	$ 1.28	$ 1	$ 0.8
Repurchases of common stock, shares													1,160,940	1,043,875	24,709
Dividends paid													$ 45,078,000	$ 36,320,000	$ 28,734,000
Stock repurchase authorized amount																	150,000,000
Repurchase of common stock													80,831,000	77,661,000	1,219,000
Net Income (Loss) Available to Common Stockholders, Basic													84,300,000	186,737,000	130,102,000
Interest expense on assumed conversion of 3% Convertible Notes, net of tax													0	0	0
Income available to common stockholders - diluted													84,300,000	186,737,000	130,102,000
Weighted average number of common shares outstanding - basic													35,193,480	36,283,853	36,010,191
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													335,125	412,911	479,821
Weighted average number of common shares outstanding - diluted													35,528,605	36,696,764	36,490,012
Basic earnings per share	$ 0.43	$ (0.03)	$ 0.74	$ 1.24	$ 0.84	$ 0.52	$ 3.04	$ 0.74					$ 2.40	$ 5.15	$ 3.61
Diluted earnings per share	$ 0.43	$ (0.03)	$ 0.73	$ 1.23	$ 0.83	$ 0.51	$ 3.01	$ 0.74					$ 2.37	$ 5.09	$ 3.57
Per Principal Amount Of Convertible Debt													1,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax Beginning Balance				(156,506,000)				(199,683,000)				(159,239,000)	(156,506,000)	(199,683,000)	(159,239,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax													(119,146,000)	36,873,000	(45,400,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax													5,323,000	6,304,000	4,956,000
Other comprehensive income													(113,823,000)	43,177,000	(40,444,000)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	0				0				0				0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax Ending Balance	(270,329,000)				(156,506,000)				(199,683,000)				(270,329,000)	(156,506,000)	(199,683,000)
Currency translation adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax Beginning Balance				57,812,000				14,689,000				30,350,000	57,812,000	14,689,000	30,350,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax													(76,845,000)	19,810,000	(11,982,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax													0	0	0
Other comprehensive income													(76,845,000)	19,810,000	(11,982,000)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(20,033,000)				23,313,000				(3,679,000)				(20,033,000)	23,313,000	(3,679,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax Ending Balance	(39,066,000)				57,812,000				14,689,000				(39,066,000)	57,812,000	14,689,000
Pension liability adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax Beginning Balance				(214,318,000)				(214,372,000)				(189,589,000)	(214,318,000)	(214,372,000)	(189,589,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax													(42,301,000)	17,063,000	(33,418,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax													5,323,000	6,304,000	4,956,000
Other comprehensive income													(36,978,000)	23,367,000	(28,462,000)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	20,033,000				(23,313,000)				3,679,000				20,033,000	(23,313,000)	3,679,000
Accumulated Other Comprehensive Income (Loss), Net of Tax Ending Balance	(231,263,000)				(214,318,000)				(214,372,000)				(231,263,000)	(214,318,000)	(214,372,000)
Subsequent Event [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Cash dividends declared per common share																$ 0.34
Stock Repurchase Program, Remaining Authorized Repurchase Amount																		125,000,000
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding													682,800	297,595	469,289
Weighted average exercise price	$ 69.04				$ 43.59				$ 43.88				$ 69.04	$ 43.59	$ 43.88
Restricted Stock Awards [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding													0	7,416	171
Weighted average exercise price	$ 0.00				$ 70.90				$ 48.14				$ 0.00	$ 70.90	$ 48.14
Excess Conversion [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Per Principal Amount Of Convertible Debt													1,000
Convertible Notes Payable [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Price	$ 73.07												$ 73.07
Debt Instrument, Convertible, Conversion Ratio													13.6849
Per Principal Amount Of Convertible Debt													$ 1,000
Convertible Notes Payable [Member] | Excess Conversion [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Ratio													8.8952