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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
 6 Months Ended
Mar. 31, 2024
USD ($)
$ / shares
shares
Options Outstanding [Roll Forward]  
Options Outstanding, Beginning Balance (in shares) | shares 1,553
Options Outstanding, Granted (in shares) | shares 87
Options Outstanding, Exercised (in shares) | shares (66)
Options Outstanding, Forfeited / Canceled (in shares) | shares (17)
Options Outstanding, Ending Balance (in shares) | shares 1,557
Options Outstanding, Exercisable (in shares) | shares 1,152
Weighted Average Exercise Price [Roll Forward]  
Weighted Average Exercise Price, Beginning Balance $ 18.52
Weighted Average Exercise Price, Granted 24.58
Weighted Average Exercise Price, Exercised 27.93
Weighted Average Exercise Price, Forfeited / Canceled 29.97
Weighted Average Exercise Price, Ending Balance 18.92
Weighted Average Exercise Price, Exercisable $ 17.20
Weighted Average Remaining Contractual Term [Abstract]  
Weighted Average Remaining Contractual Term, Outstanding 3 years 7 months 6 days
Weighted Average Remaining Contractual Term, Exercisable 3 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding | $ $ 20,785 [1]
Aggregate Intrinsic Value, Exercisable | $ $ 17,160 [1]
Closing Stock Price $ 31.93
[1] The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $31.93 as of March 31, 2024, which would have been received by the option holders had all option holders exercised their options as of that date.
12. STOCK-BASED COMPENSATION (CONTINUED)
The intrinsic value of an option is the amount by which the fair value of the underlying stock exceeds its exercise price.