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STOCKHOLDERS' EQUITY: (Details 4) (USD $)
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Accumulated balances for each component of other comprehensive income      
Foreign currency translation $ 13,686,000 $ 12,175,000  
Unrealized loss on interest rate swap (24,000) (752,000)  
Accumulated Other Comprehensive Income 13,662,000 11,423,000  
Restricted stock units
     
Restricted Stock Unit Activity - Other disclosures      
Share-based compensation expense 11,600,000 10,100,000 7,800,000
Future expense      
2015 10,300,000    
2016 6,400,000    
2017 2,600,000    
2018 600,000    
Restricted stock units | Time-vesting
     
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 1,212,286    
Granted (in shares) 523,000 681,408 787,451
Vested (in shares) (482,185)    
Forfeited or cancelled (in shares) (175,072)    
Outstanding at the end of the period (in shares) 1,078,029 1,212,286  
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) $ 13.99    
Granted (in dollars per share) $ 23.90    
Vested (in dollars per share) $ 13.86    
Forfeited or cancelled (in dollars per share) $ 16.42    
Outstanding at the end of the period (in dollars per share) $ 18.46 $ 13.99  
Weighted-average remaining contractual term      
Weighted-average remaining contractual term at the beginning of the period 2 years 2 months 1 day 2 years 2 months 26 days  
Weighted-average remaining contractual term at the end of the period 2 years 2 months 1 day 2 years 2 months 26 days  
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted 12,500,000 9,600,000 10,400,000
Total fair value of units vested 11,100,000 6,900,000 6,900,000
Restricted stock units | Vesting in equal annual increments over four years
     
Non-vested restricted stock unit activity      
Granted (in shares) 442,103 604,229 654,357
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 4 years 4 years 4 years
Restricted stock units | Vesting in equal annual increments over two years
     
Non-vested restricted stock unit activity      
Granted (in shares) 25,000    
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 2 years    
Restricted stock units | Vesting in one year
     
Non-vested restricted stock unit activity      
Granted (in shares) 55,897 77,179 133,094
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) 863,721    
Granted (in shares) 237,861 384,563 530,137
Vested (in shares) 0 0  
Forfeited or cancelled (in shares) (34,754)    
Outstanding at the end of the period (in shares) 1,066,828 863,721  
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) $ 11.52    
Granted (in dollars per share) $ 24.59    
Forfeited or cancelled (in dollars per share) $ 18.93    
Outstanding at the end of the period (in dollars per share) $ 14.19 $ 11.52  
Weighted-average remaining contractual term      
Weighted-average remaining contractual term at the beginning of the period 10 months 28 days 1 year 7 months 17 days  
Weighted-average remaining contractual term at the end of the period 10 months 28 days 1 year 7 months 17 days  
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted 5,800,000 5,200,000 5,400,000
Pricing model used for share-based compensation arrangement Monte Carlo Monte Carlo Monte Carlo
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 | Executive officer | Expected to vest
     
Restricted Stock Unit Activity - Other disclosures      
Performance share awards vested (as a percent) 160.00%    
Number of units 115,086    
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 | Executive officer | Expected to vest
     
Restricted Stock Unit Activity - Other disclosures      
Share awards vesting percentage 100.00%    
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 900,000    
Shares purchased by the employees 100,451 100,451 100,451
Share-based compensation expense $ 0