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STOCKHOLDERS' EQUITY: (Details 4) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Accumulated balances for each component of other comprehensive income      
Foreign currency translation $ 12,175,000 $ 14,664,000  
Unrealized loss on interest rate swap (752,000) (1,063,000)  
Total accumulated balance of other comprehensive income 11,423,000 13,601,000  
Restricted stock units
     
Restricted Stock Unit Activity - Other disclosures      
Share-based compensation expense 10,100,000 7,800,000 10,700,000
Future expense      
2014 8,800,000    
2015 5,700,000    
2016 2,200,000    
2017 400,000    
Restricted stock units | Time-vesting
     
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 1,175,161    
Granted (in shares) 681,408 787,451 539,729
Vested (in shares) (470,285)    
Forfeited or cancelled (in shares) (173,998)    
Outstanding at the end of the period (in shares) 1,212,286 1,175,161  
Non-vested restricted stock units, Weighted average fair value per share at grant date      
Outstanding at the beginning of the period (in dollars per share) $ 13.40    
Granted (in dollars per share) $ 14.07    
Vested (in dollars per share) $ 12.64    
Forfeited or cancelled (in dollars per share) $ 13.99    
Outstanding at the end of the period (in dollars per share) $ 13.97 $ 13.40  
Weighted-average remaining contractual term (in years)      
Weighted-average remaining contractual term at the beginning of the period 2 years 2 months 26 days 2 years 2 months 16 days  
Weighted-average remaining contractual term at the end of the period 2 years 2 months 26 days 2 years 2 months 16 days  
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted 9,600,000 10,400,000 9,400,000
Total fair value of units vested 6,900,000 6,900,000 2,600,000
Restricted stock units | Vesting in equal annual increments over four years
     
Non-vested restricted stock unit activity      
Granted (in shares) 604,229 654,357 467,641
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 4 years 4 years 4 years
Restricted stock units | Vesting in one year
     
Non-vested restricted stock unit activity      
Granted (in shares) 77,179 133,094 72,088
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 1 year 1 year 1 year
Restricted stock units | Performance-based
     
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 511,864    
Granted (in shares) 384,563 530,137 191,790
Vested (in shares) 0   0
Forfeited or cancelled (in shares) (32,706)    
Outstanding at the end of the period (in shares) 863,721 511,864  
Non-vested restricted stock units, Weighted average fair value per share at grant date      
Outstanding at the beginning of the period (in dollars per share) $ 10.91    
Granted (in dollars per share) $ 13.50    
Forfeited or cancelled (in dollars per share) $ 25.25    
Outstanding at the end of the period (in dollars per share) $ 11.52 $ 10.91  
Weighted-average remaining contractual term (in years)      
Weighted-average remaining contractual term at the beginning of the period 1 year 7 months 17 days 2 years 3 months 22 days  
Weighted-average remaining contractual term at the end of the period 1 year 7 months 17 days 2 years 3 months 22 days  
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted 5,200,000 5,400,000 4,700,000
Total fair value of units vested   6,400,000  
Restricted stock units | Vesting based on total shareholder return
     
Non-vested restricted stock unit activity      
Granted (in shares) 333,463 172,945  
Restricted stock units | Vesting based on total shareholder return | Minimum
     
Restricted Stock Unit Activity - Other disclosures      
Performance share awards vested (as a percent) 0.00% 0.00% 0.00%
Restricted stock units | Vesting based on total shareholder return | Maximum
     
Restricted Stock Unit Activity - Other disclosures      
Performance share awards vested (as a percent) 200.00% 200.00% 200.00%
Restricted stock units | Vesting based on common stock price targets | Executive officer
     
Non-vested restricted stock unit activity      
Granted (in shares) 51,100 357,192  
Restricted stock units | Vesting based on common stock price targets | Maximum | Executive officer
     
Restricted Stock Unit Activity - Other disclosures      
Performance share awards vested (as a percent) 100.00% 100.00%  
ESPP
     
Future expense      
Number of shares available for issuance 1,000,000    
Shares purchased by the employees 122,427 122,427 122,427
Share-based compensation expense $ 0