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Stock-Based Compensation (Exercise Price Range) (Details) - Stock Options
shares in Thousands
12 Months Ended
Sep. 30, 2023
$ / shares
shares
$9.03 - $11.87  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range $ 9.03
Exercise Price Range, Upper Range $ 11.87
Options Outstanding | shares 295
Weighted Average Remaining Contractual Term 2 years 1 month 28 days
Weighted Average Exercise Price, Options Outstanding $ 11.37
Number of Shares Vested, Options Exercisable | shares 288
Weighted Average Exercise Price, Options Exercisable $ 11.38
$12.48 - $16.75  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 12.48
Exercise Price Range, Upper Range $ 16.75
Options Outstanding | shares 325
Weighted Average Remaining Contractual Term 3 years 7 months 2 days
Weighted Average Exercise Price, Options Outstanding $ 15.35
Number of Shares Vested, Options Exercisable | shares 262
Weighted Average Exercise Price, Options Exercisable $ 15.10
$17.10 - $17.94  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 17.10
Exercise Price Range, Upper Range $ 17.94
Options Outstanding | shares 365
Weighted Average Remaining Contractual Term 3 years 4 months 20 days
Weighted Average Exercise Price, Options Outstanding $ 17.65
Number of Shares Vested, Options Exercisable | shares 312
Weighted Average Exercise Price, Options Exercisable $ 17.70
$18.20 - $21.53  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 18.20
Exercise Price Range, Upper Range $ 21.53
Options Outstanding | shares 273
Weighted Average Remaining Contractual Term 5 years 2 months 23 days
Weighted Average Exercise Price, Options Outstanding $ 20.86
Number of Shares Vested, Options Exercisable | shares 105
Weighted Average Exercise Price, Options Exercisable $ 20.90
$23.46 - $33.53  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 23.46
Exercise Price Range, Upper Range $ 33.53
Options Outstanding | shares 230
Weighted Average Remaining Contractual Term 5 years 1 month 9 days
Weighted Average Exercise Price, Options Outstanding $ 24.44
Number of Shares Vested, Options Exercisable | shares 95
Weighted Average Exercise Price, Options Exercisable $ 24.27
$35.84 - $40.66  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 35.84
Exercise Price Range, Upper Range $ 40.66
Options Outstanding | shares 48
Weighted Average Remaining Contractual Term 6 years 2 months 1 day
Weighted Average Exercise Price, Options Outstanding $ 40.51
Number of Shares Vested, Options Exercisable | shares 0
Weighted Average Exercise Price, Options Exercisable $ 0
$41.16 - $41.16  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 41.16
Exercise Price Range, Upper Range $ 41.16
Options Outstanding | shares 17
Weighted Average Remaining Contractual Term 6 years 1 month 13 days
Weighted Average Exercise Price, Options Outstanding $ 41.16
Number of Shares Vested, Options Exercisable | shares 0
Weighted Average Exercise Price, Options Exercisable $ 0
$9.03 - $41.16  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 7.40
Exercise Price Range, Upper Range $ 41.16
Options Outstanding | shares 1,553
Weighted Average Remaining Contractual Term 3 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding $ 18.52
Number of Shares Vested, Options Exercisable | shares 1,062
Weighted Average Exercise Price, Options Exercisable $ 16.24