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Common Shares (Tables) | 9 Months Ended
--- | ---
Jan. 31, 2020
Stockholders' Equity Note [Abstract] |
Common Shares Information | The following table sets forth common share information.
| January 31, 2020 |  | April 30, 2019
Common shares authorized | 300.0 |  |  | 300.0 |
Common shares outstanding | 114.0 |  |  | 113.7 |
Treasury shares | 32.5 |  |  | 32.8 |

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