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OTHER CURRENT AND NONCURRENT ASSETS: Narrative (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - IT Infrastructure Management Business - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Retained profits interest   $ 0.7
Gain on disposition of business $ 30.1  
Proceeds from divestiture of businesses $ 31.0