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STOCKHOLDERS' EQUITY: - Stock Option Activity of Continuing Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 02, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based compensation        
Exercised (in dollars per share)   $ 6.13    
Exercised   $ 6,666    
Data Plus Math Corporation        
Share-based compensation        
Total fair value of the replacement stock options issued   $ 7,400    
Expected dividend yield   0.00%    
Risk free interest rate, minimum   1.86%    
Risk free interest rate, maximum   1.96%    
Expected volatility rate   45.00%    
Number of option fully vested (in shares)   48,619    
Fair value of replacement stock options considered a component of purchase price $ 2,300      
Share-based payment arrangement, amount capitalized   $ 5,100    
Data Plus Math Corporation | Minimum        
Share-based compensation        
Expected term   7 years 3 months 29 days    
Data Plus Math Corporation | Maximum        
Share-based compensation        
Expected term   9 years 6 months 18 days    
Stock options        
Share-based compensation        
Exercised   $ 6,700 $ 35,300 $ 6,500
Stock options | Data Plus Math Corporation        
Share-based compensation        
Shares issued in period (in shares)   162,481    
Exercised (in dollars per share)   $ 1.64