DIVIDENDS, SHARE REPURCHASES, EARNINGS PER SHARE AND ACCUMULATED OTHER COMPREHENSIVE INCOME (Details)		3 Months Ended
	Aug. 05, 2015 $ / shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares	Jul. 31, 2015 USD ($)	Nov. 06, 2014 USD ($)
Dividends, Share Repurchases, Earnings Per Share and Accumulated Other Comprehensive Income [Line Items]
Cash dividends declared per common share | $ / shares		$ 0.34	$ 0.32
Stock repurchase program, authorized amount					$ 150,000,000
Repurchase of common stock		$ 0	$ 20,157,000
Repurchases of common stock, shares | shares		0	270,598
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Income (loss) available to common stockholders - basic		$ (9,558,000)	$ 44,109,000
Interest expense on assumed conversion of 3% Convertible Notes, net of tax		0	0
Income available to common stockholders - diluted		$ (9,558,000)	$ 44,109,000
Weighted average number of common shares outstanding - basic | shares		34,857,969	35,564,328
Assumed conversion of 3% Convertible Senior Noted outstanding during the period | shares		0	0
Net effect of dilutive stock options, restricted stock units and restricted stock awards based on the treasury stock method | shares		0	301,578
Weighted average number of common shares outstanding - diluted | shares		34,857,969	35,865,906
Basic earnings (loss) per common share | $ / shares		$ (0.27)	$ 1.24
Diluted earnings (loss) per common share | $ / shares		$ (0.27)	$ 1.23
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income - beginning balance		$ (270,329,000)
Other comprehensive income before reclassification		14,714,000
Reclassification from accumulated other comprehensive income		0
Net current period other comprehensive income		14,714,000
Foreign exchange rate impact		0
Accumulated other comprehensive income - ending balance		(255,615,000)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income - beginning balance		(39,066,000)
Other comprehensive income before reclassification		14,714,000
Reclassification from accumulated other comprehensive income		0
Net current period other comprehensive income		14,714,000
Foreign exchange rate impact		16,072,000
Accumulated other comprehensive income - ending balance		(8,280,000)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income - beginning balance		(231,263,000)
Other comprehensive income before reclassification		0
Reclassification from accumulated other comprehensive income		0
Net current period other comprehensive income		0
Foreign exchange rate impact		(16,072,000)
Accumulated other comprehensive income - ending balance		$ (247,335,000)
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding | shares		747,253	302,447
Restricted Stock Awards [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding | shares		262,746	43,391
Quarter To Date [Member] | Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average exercise price - antidilutive | $ / shares		$ 68.47	$ 62.17
Quarter To Date [Member] | Restricted Stock Awards [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average exercise price - antidilutive | $ / shares		58.53	$ 74.46
Convertible Notes Payable [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price | $ / shares		$ 72.27
Per principal amount of convertible debt		$ 1,000
Subsequent Event [Member]
Dividends, Share Repurchases, Earnings Per Share and Accumulated Other Comprehensive Income [Line Items]
Cash dividends declared per common share | $ / shares	$ 0.34
Stock repurchase program, remaining authorized repurchase amount				$ 125,000,000
Base Conversion [Member] | Convertible Notes Payable [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Debt instrument, convertible, conversion ratio		13.8373
Excess Conversion [Member] | Convertible Notes Payable [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Debt instrument, convertible, conversion ratio		8.9912