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STOCKHOLDERS' EQUITY: - Share-based Compensation Plans & Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Restricted Stock Unit Activity - Other disclosures      
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) 42,300,000    
Shares which remained available for future grants (in shares) 12,100,000    
Stock options      
Stock Option Activity - Number of Shares      
Outstanding at beginning of the period (in shares) 2,456,184    
Exercised (in shares) (1,056,163)    
Forfeited or cancelled (in shares) (25,591)    
Outstanding at end of the period (in shares) 1,374,430 2,456,184  
Exercisable at the end of the period (in shares) 1,213,177    
Weighted-average exercise price per share      
Outstanding at the beginning of the period (in dollars per share) $ 13.30    
Exercised (in dollars per share) 11.20    
Forfeited or cancelled (in dollars per share) 18.64    
Outstanding at the end of the period (in dollars per share) 14.81 $ 13.30  
Exercisable at the end of the period (in dollars per share) $ 15.67    
Weighted-average remaining contractual term      
Outstanding at the end of the period 4 years 6 months    
Exercisable at the end of the period 4 years 2 months 12 days    
Aggregate intrinsic value      
Exercised $ 35,337 $ 6,500 $ 7,700
Outstanding at the end of the period 54,950    
Exercisable at the end of the period $ 47,462