Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Basic and Dilutive Common Shares Outstanding Used in Determining Net Income Per Share (Detail)

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Summary of Significant Accounting Policies - Basic and Dilutive Common Shares Outstanding Used in Determining Net Income Per Share (Detail) - $ / shares
shares in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]      
Basic common shares outstanding 442.6 441.9 441.2
Dilutive effect of stock awards 1.5 1.1 1.1
Diluted common shares outstanding 444.1 443.0 442.3
Net income per share - basic $ 0.55 $ 0.52 $ 0.33
Net income per share - diluted $ 0.54 $ 0.52 $ 0.33