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Shares and Preferred Shares (Notes) | 6 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | Shares and Preferred Shares Ordinary shares We calculate basic earnings per share based upon the weighted average number of shares outstanding. We calculate diluted earnings per share based upon the weighted average number of shares outstanding plus the dilutive effect of share equivalents calculated using the treasury stock method. The following is a summary of shares and share equivalents outstanding used in the calculations of basic and diluted earnings per share:
|  | Three Months Ended September 30, |  | Six Months Ended September 30,
Denominator (shares in thousands): |  | 2021 |  | 2020 |  | 2021 |  | 2020
Weighted average shares outstanding—basic |  | 99,848 |  |  | 85,170 |  |  | 95,000 |  |  | 85,065 |
Dilutive effect of share equivalents |  | 841 |  |  | 674 |  |  | 840 |  |  | 695 |
Weighted average shares outstanding and share equivalents—diluted |  | 100,689 |  |  | 85,844 |  |  | 95,840 |  |  | 85,760 |
Options to purchase the following number of shares were outstanding but excluded from the computation of diluted earnings per share because the combined exercise prices, unamortized fair values, and assumed tax benefits upon exercise were greater than the average market price for the shares during the periods, so including these options would be anti-dilutive:
|  | Three Months Ended September 30, |  | Six Months Ended September 30,
(shares in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Number of share options |  | 209 |  |  | 503 |  |  | 241 |  |  | 416 |
Additional Authorized Shares The Company has an additional authorized share capital of 50,000,000 preferred shares of $0.001 par value each, plus 25,000 deferred ordinary shares of €1.00 par value each, in order to satisfy minimum statutory capital requirements for all Irish public limited companies.

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