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STOCK-BASED COMPENSATION: - Time-vesting restricted stock unit, narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 21, 2021
Sep. 30, 2021
Diablo.AI, Inc.    
Share-based compensation    
Vesting period 3 years  
Restricted stock units | Time Based Vesting    
Share-based compensation    
Granted (in shares)   2,218,586
Aggregate fair value of restricted stock units granted   $ 104.8
Vested in period, fair value   $ 6.9
Restricted stock units | Time Based Vesting | Diablo.AI, Inc.    
Share-based compensation    
Granted (in shares)   98,442
Aggregate fair value of restricted stock units granted   $ 4.7
Restricted stock units | Vesting in four years    
Share-based compensation    
Vesting period   4 years