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Stock-Based Compensation (Exercise Price Range) (Details) - Stock Options
shares in Thousands
12 Months Ended
Sep. 30, 2021
$ / shares
shares
$7.40 - $9.03  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range $ 7.40
Exercise Price Range, Upper Range $ 9.35
Options Outstanding | shares 463
Weighted Average Remaining Contractual Term 1 year 3 months 3 days
Weighted Average Exercise Price, Options Outstanding $ 8.44
Number of Shares Vested, Options Exercisable | shares 463
Weighted Average Exercise Price, Options Exercisable $ 8.44
$9.04 - $10.33  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 9.70
Exercise Price Range, Upper Range $ 10.81
Options Outstanding | shares 470
Weighted Average Remaining Contractual Term 2 years
Weighted Average Exercise Price, Options Outstanding $ 10.32
Number of Shares Vested, Options Exercisable | shares 455
Weighted Average Exercise Price, Options Exercisable $ 10.32
$10.35 - $11.23  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 10.96
Exercise Price Range, Upper Range $ 11.87
Options Outstanding | shares 463
Weighted Average Remaining Contractual Term 3 years 7 months 20 days
Weighted Average Exercise Price, Options Outstanding $ 11.55
Number of Shares Vested, Options Exercisable | shares 323
Weighted Average Exercise Price, Options Exercisable $ 11.57
$11.24 - $12.63  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 12.48
Exercise Price Range, Upper Range $ 13.50
Options Outstanding | shares 414
Weighted Average Remaining Contractual Term 2 years 1 month 24 days
Weighted Average Exercise Price, Options Outstanding $ 13.14
Number of Shares Vested, Options Exercisable | shares 413
Weighted Average Exercise Price, Options Exercisable $ 13.14
$12.64 - $13.92  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 13.76
Exercise Price Range, Upper Range $ 16.75
Options Outstanding | shares 453
Weighted Average Remaining Contractual Term 5 years 7 months 20 days
Weighted Average Exercise Price, Options Outstanding $ 15.28
Number of Shares Vested, Options Exercisable | shares 93
Weighted Average Exercise Price, Options Exercisable $ 13.81
$13.93 - $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 593
Weighted Average Remaining Contractual Term 5 years 6 months 10 days
Weighted Average Exercise Price, Options Outstanding $ 17.56
Number of Shares Vested, Options Exercisable | shares 171
Weighted Average Exercise Price, Options Exercisable $ 17.75
$17.95 - $18.20  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 18.20
Exercise Price Range, Upper Range $ 25.15
Options Outstanding | shares 96
Weighted Average Remaining Contractual Term 6 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding $ 21.63
Number of Shares Vested, Options Exercisable | shares 9
Weighted Average Exercise Price, Options Exercisable $ 18.20
$7.40 - $18.20  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 7.40
Exercise Price Range, Upper Range $ 25.15
Options Outstanding | shares 2,952
Weighted Average Remaining Contractual Term 3 years 6 months 25 days
Weighted Average Exercise Price, Options Outstanding $ 13.20
Number of Shares Vested, Options Exercisable | shares 1,927
Weighted Average Exercise Price, Options Exercisable $ 11.55