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Common Shares (Tables)
 12 Months Ended
Mar. 31, 2023
Notes To Financial Statements [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block]
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 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] 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