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SHARE CAPITAL, EARNINGS PER SHARE AND DIVIDENDS - Earnings per share computation (Details) - shares
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share Capital, Reserves And Other Equity Interest [Abstract]    
Weighted average number of common shares outstanding, shares 265,951,131 266,580,019
Effect of dilutive stock options, shares 1,644,353 1,394,135
Weighted average number of common shares outstanding for diluted earnings per share calculation, shares 267,595,484 267,974,154