v3.3.0.814
DIVIDENDS, SHARE REPURCHASES, EARNINGS PER SHARE AND ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
 3 Months Ended 6 Months Ended
Nov. 05, 2015
Aug. 13, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dividends, Share Repurchases and Earnings Per Share [Line Items]            
Cash dividends declared per common share     $ 0.34 $ 0.32 $ 0.68 $ 0.64
Payments for repurchase of common stock       $ 23,300,000 $ 0 $ 43,423,000
Treasury Stock, Shares, Acquired       324,720   595,318
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]            
Income available to common stockholders - basic     $ (42,329,000) $ 26,082,000 (51,887,000) $ 70,191,000
Interest expense on assumed conversion of 3% Convertible Notes, net of tax     0 0 0 0
Income available to common stockholders - diluted     $ (42,329,000) $ 26,082,000 $ (51,887,000) $ 70,191,000
Weighted average number of common shares outstanding - basic     34,921,891 35,447,094 34,876,010 35,495,319
Assumed conversion of 3% Convertible Senior Noted outstanding during the period     0 0 0 0
Net effect of dilutive stock options, restricted stock units and restricted stock awards based on the treasury stock method     0 234,398 0 301,167
Weighted average number of common shares outstanding - diluted     34,921,891 35,681,492 34,876,010 35,796,486
Basic earnings per share     $ (1.21) $ 0.74 $ (1.49) $ 1.98
Diluted earnings per share     $ (1.21) $ 0.73 $ (1.49) $ 1.96
Repayment of debt         $ 323,569,000 $ 282,838,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]            
Accumulated Other Comprehensive Income (Loss) - Beginning Balance         (270,329,000)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax         (3,771,000)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax         0  
Other comprehensive income         (3,771,000)  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax     $ 0   0  
Accumulated Other Comprehensive Income (Loss) - Ending Balance     (274,100,000)   (274,100,000)  
Accumulated Translation Adjustment            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]            
Accumulated Other Comprehensive Income (Loss) - Beginning Balance         (39,066,000)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax         (3,771,000)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax         0  
Other comprehensive income         (3,771,000)  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax     4,074,000   4,074,000  
Accumulated Other Comprehensive Income (Loss) - Ending Balance     (38,763,000)   (38,763,000)  
Accumulated Defined Benefit Plans Adjustment            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]            
Accumulated Other Comprehensive Income (Loss) - Beginning Balance         (231,263,000)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax         0  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax         0  
Other comprehensive income         0  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax     (4,074,000)   (4,074,000)  
Accumulated Other Comprehensive Income (Loss) - Ending Balance     $ (235,337,000)   $ (235,337,000)  
Stock Options            
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]            
Outstanding     1,292,639 298,333 592,067 300,686
Weighted average exercise price     $ 61.87 $ 62.17 $ 68.99 $ 62.17
Restricted Stock Awards            
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]            
Outstanding     348,182 2,313 296,205 1,150
Weighted average exercise price     $ 49.79 $ 72.98 $ 49.22 $ 72.98
Subsequent event            
Dividends, Share Repurchases and Earnings Per Share [Line Items]            
Cash dividends declared per common share $ 0.34          
Stock repurchase program, authorized amount $ 150,000,000          
Senior Notes | Convertible Senior Notes Due 2038            
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]            
Repayment of debt         $ 115,000,000  
Other debt | Convertible Senior Notes Due 2038            
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]            
Per principal amount of convertible debt   $ 1,000