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STOCKHOLDERS' EQUITY: - AMS Restricted Stock Unit Accelerations (Details) - Time Vesting Restricted Stock Units
$ in Millions
12 Months Ended
Mar. 31, 2019
USD ($)
shares
Share-based compensation  
Granted (in shares) | shares 1,187,344
Accelerated compensation cost $ 54.0
Incremental compensation cost 27.0
Accelerated original grant date fair value, compensation cost $ 27.0