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Stock-Based Compensation (Exercise Price Range) (Details) - Stock Options
shares in Thousands
12 Months Ended
Sep. 30, 2020
$ / 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 $ 9.03
Options Outstanding | shares 485
Weighted Average Remaining Contractual Term 2 years 3 months 29 days
Weighted Average Exercise Price, Options Outstanding $ 8.22
Number of Shares Vested, Options Exercisable | shares 485
Weighted Average Exercise Price, Options Exercisable $ 8.22
$9.04 - $10.33  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 9.04
Exercise Price Range, Upper Range $ 10.33
Options Outstanding | shares 542
Weighted Average Remaining Contractual Term 3 years 7 months 9 days
Weighted Average Exercise Price, Options Outstanding $ 10.04
Number of Shares Vested, Options Exercisable | shares 427
Weighted Average Exercise Price, Options Exercisable $ 9.98
$10.35 - $11.23  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 10.35
Exercise Price Range, Upper Range $ 11.23
Options Outstanding | shares 602
Weighted Average Remaining Contractual Term 3 years 5 months 1 day
Weighted Average Exercise Price, Options Outstanding $ 10.94
Number of Shares Vested, Options Exercisable | shares 405
Weighted Average Exercise Price, Options Exercisable $ 10.86
$11.24 - $12.63  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 11.24
Exercise Price Range, Upper Range $ 12.63
Options Outstanding | shares 620
Weighted Average Remaining Contractual Term 3 years 9 months 14 days
Weighted Average Exercise Price, Options Outstanding $ 12.08
Number of Shares Vested, Options Exercisable | shares 448
Weighted Average Exercise Price, Options Exercisable $ 12.17
$12.64 - $13.92  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 12.64
Exercise Price Range, Upper Range $ 13.92
Options Outstanding | shares 573
Weighted Average Remaining Contractual Term 4 years 5 months 23 days
Weighted Average Exercise Price, Options Outstanding $ 13.65
Number of Shares Vested, Options Exercisable | shares 339
Weighted Average Exercise Price, Options Exercisable $ 13.53
$13.93 - $17.94  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 13.93
Exercise Price Range, Upper Range $ 17.94
Options Outstanding | shares 536
Weighted Average Remaining Contractual Term 6 years 18 days
Weighted Average Exercise Price, Options Outstanding $ 17.62
Number of Shares Vested, Options Exercisable | shares 11
Weighted Average Exercise Price, Options Exercisable $ 14.75
$17.95 - $18.20  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 17.95
Exercise Price Range, Upper Range $ 18.20
Options Outstanding | shares 35
Weighted Average Remaining Contractual Term 6 years 1 month 20 days
Weighted Average Exercise Price, Options Outstanding $ 18.20
Number of Shares Vested, Options Exercisable | shares 0
Weighted Average Exercise Price, Options Exercisable $ 0
$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 $ 18.20
Options Outstanding | shares 3,393
Weighted Average Remaining Contractual Term 3 years 11 months 23 days
Weighted Average Exercise Price, Options Outstanding $ 12.20
Number of Shares Vested, Options Exercisable | shares 2,115
Weighted Average Exercise Price, Options Exercisable $ 10.80