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Shares and Preferred Shares (Notes)
 6 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Earnings Per Share
12. 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. Income from continuing operations is used as the benchmark to determine whether share equivalents are dilutive or anti-dilutive. Earnings per share is calculated independently for earnings per share from continuing operations and earnings per share from discontinued operations. The sum of earnings per share from continuing operations and earnings per share from discontinued operations may not equal total company earnings per share due to rounding.
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):2024202320242023
Weighted average shares outstanding—basic98,669 98,785 98,769 98,747 
Dilutive effect of share equivalents535 621 521 576 
Weighted average shares outstanding and share equivalents—diluted99,204 99,406 99,290 99,323 
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)2024202320242023
Number of share options599 625 632 647 
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.