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Shares and Preferred Shares Shares and Preferred Shares (Tables)
6 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block]
 Three Months Ended September 30, Six Months Ended September 30,
Denominator (shares in thousands):2021202020212020
Weighted average shares outstanding—basic99,848 85,170 95,000 85,065 
Dilutive effect of share equivalents841 674 840 695 
Weighted average shares outstanding and share equivalents—diluted100,689 85,844 95,840 85,760 
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:
 Three Months Ended September 30, Six Months Ended September 30,
(shares in thousands)2021202020212020
Number of share options209 503 241 416