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PROPERTY AND EQUIPMENT: Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 8.9 $ 15.3 $ 15.6
Accelerated depreciation   $ 3.6 $ 3.8