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Common Shares
 12 Months Ended
Mar. 31, 2023
Notes To Financial Statements [Abstract]  
Earnings Per Share [Text Block]
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. The following is a summary of shares and share equivalents outstanding used in the calculations of basic and diluted earnings per share:
Years ended March 31,202320222021
Denominator (shares in thousands):
Weighted average shares outstanding—basic99,706 97,535 85,203 
Dilutive effect of share equivalents540 791 695 
Weighted average shares outstanding and share equivalents—diluted100,246 98,326 85,898 
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:
Years ended March 31,202320222021
Number of ordinary share options (shares in thousands)
578 243 348 
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.