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Shares and Preferred Shares Ordinary Shares (Details)
3 Months Ended 6 Months Ended
Sep. 30, 2024
$ / shares
shares
Sep. 30, 2023
shares
Sep. 30, 2024
$ / shares
shares
Sep. 30, 2023
shares
Sep. 30, 2024
EUR (€)
shares
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]          
Weighted average shares outstanding - basic 98,669,000 98,785,000 98,769,000 98,747,000  
Dilutive effect of share equivalents 535,000 621,000 521,000 576,000  
Weighted average shares outstanding and share equivalents - diluted 99,204,000 99,406,000 99,290,000 99,323,000  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Preferred Stock, Shares Authorized         50,000,000
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.001   $ 0.001    
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.001   $ 0.001    
Deferred Ordinary Shares         25,000
Employee share option          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of share options that are antidilutive 599,000 625,000 632,000 647,000  
Euro Member Countries, Euro          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Par Value (Euros) of Deferred Ordinary Shares | €         € 1.00