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Stock-Based Compensation (Options and Common Shares Reserved for Grant) (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Options Outstanding [Roll Forward]  
Options Outstanding, Beginning Balance | shares 1,790
Options Outstanding, Granted | shares 66
Options Outstanding, Exercised | shares (262)
Options Outstanding, Forfeited / Cancelled | shares (41)
Options Outstanding, Ending Balance | shares 1,553
Options Outstanding, Exercisable | shares 1,062
Weighted Average Exercise Price [Roll Forward]  
Weighted Average Exercise Price, Beginning Balance $ 17.29
Weighted Average Exercise Price, Granted 40.59
Weighted Average Exercise Price, Exercised 13.69
Weighted Average Exercise Price, Forfeited / Cancelled 20.24
Weighted Average Exercise Price, Ending Balance 18.52
Weighted Average Exercise Price, Exercisable $ 16.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted Average Remaining Contractual Term, Outstanding 4 years 8 months 12 days
Weighted Average Remaining Contractual Term, Exercisable 3 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding | $ $ 14,167
Aggregate Intrinsic Value, Exercisable | $ $ 11,451
Closing Stock Price $ 27.00