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STOCK-BASED COMPENSATION: - Performance-based restricted stock units (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2020
Jul. 16, 2020
Mar. 31, 2020
Share-based compensation      
Business combination, contingent consideration, liability $ 0   $ 6,185
Acuity Data      
Share-based compensation      
Business combination, contingent consideration arrangements, range of outcomes, value, high   $ 5,100  
Business combination, contingent consideration, liability 700    
Acuity Data | Accrued Liabilities      
Share-based compensation      
Business combination, contingent consideration, liability $ 700    
Restricted stock units | Performance stock      
Share-based compensation      
Granted (in shares) 246,524    
Aggregate fair value of restricted stock units granted $ 10,700    
Vesting in period (in shares) 121,587    
Forfeited in period (in shares) 32,647    
Outstanding at the end of the period (in shares) 675,799   545,446
The total fair value of performance-based restricted stock units $ 6,100    
Restricted stock units | Performance Shares Vesting Total Shareholder Return      
Share-based compensation      
Granted (in shares) 73,950    
Aggregate fair value of restricted stock units granted $ 4,200    
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Minimum      
Share-based compensation      
Award vesting rights percentage 0.00%    
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Maximum      
Share-based compensation      
Award vesting rights percentage 200.00%    
Restricted stock units | Performance Shares Vesting Under The Second Plan      
Share-based compensation      
Granted (in shares) 172,574    
Aggregate fair value of restricted stock units granted $ 6,500    
Award vesting rights percentage 50.00%    
Restricted stock units | Performance Shares Vesting Under The Second Plan | Minimum      
Share-based compensation      
Award vesting rights percentage 0.00%    
Restricted stock units | Performance Shares Vesting Under The Second Plan | Maximum      
Share-based compensation      
Award vesting rights percentage 200.00%    
Restricted stock units | Performance Shares Vesting In Three Equal Annual Increments      
Share-based compensation      
Vesting in period (in shares) 59,480    
Forfeited in period (in shares) 38,063    
Restricted stock units | Vesting Based on Relevant Performance Period Over Two Periods at March 31 2020      
Share-based compensation      
Award vesting rights percentage 164.00%    
Forfeited in period (in shares) 97,543    
Restricted stock units | Performance Shares Vesting Over Two Periods Ending September 30, 2021      
Share-based compensation      
Granted (in shares) 313,771    
Award vesting rights percentage 57.00%    
Forfeited in period (in shares) 178,146    
Outstanding at the end of the period (in shares) 441,816    
Restricted stock units | Performance Shares Vesting One-Year Anniversary Of Attainment      
Share-based compensation      
Award vesting rights percentage 50.00%    
Vesting period 1 year    
Restricted stock units | 2020 Performance Shares That Will Vest Immediately [Member]      
Share-based compensation      
Award vesting rights percentage 33.00%    
Restricted stock units | 2020 Performance Shares That Vest In Equal Increments In First Quarters Of Fiscal Years 2022 And 2023      
Share-based compensation      
Award vesting rights percentage 67.00%    
Restricted stock units | 2019 Performance Shares That Will Vest Immediately      
Share-based compensation      
Award vesting rights percentage 50.00%    
Restricted stock units | 2019 Performance Shares That Will Vest In The Second Quarter Of Fiscal Year 2022      
Share-based compensation      
Award vesting rights percentage 50.00%