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Stock-Based Compensation (Exercise Price Range) (Details) - Stock Options
shares in Thousands
12 Months Ended
Sep. 30, 2017
$ / shares
shares
$7.40 - $8.30  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range $ 7.40
Exercise Price Range, Upper Range $ 8.30
Options Outstanding | shares 858
Weighted Average Remaining Contractual Term 4 years 3 days
Weighted Average Exercise Price, Options Outstanding $ 7.95
Number of Shares Vested, Options Exercisable | shares 623
Weighted Average Exercise Price, Options Exercisable $ 7.92
$8.31 - $9.59  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 8.31
Exercise Price Range, Upper Range $ 9.59
Options Outstanding | shares 623
Weighted Average Remaining Contractual Term 3 years 11 months 23 days
Weighted Average Exercise Price, Options Outstanding $ 9.14
Number of Shares Vested, Options Exercisable | shares 551
Weighted Average Exercise Price, Options Exercisable $ 9.16
$9.60 - $10.52  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 9.60
Exercise Price Range, Upper Range $ 10.52
Options Outstanding | shares 554
Weighted Average Remaining Contractual Term 4 years 7 days
Weighted Average Exercise Price, Options Outstanding $ 9.86
Number of Shares Vested, Options Exercisable | shares 405
Weighted Average Exercise Price, Options Exercisable $ 9.84
$10.53 - $10.81  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 10.53
Exercise Price Range, Upper Range $ 10.81
Options Outstanding | shares 567
Weighted Average Remaining Contractual Term 3 years 10 months 27 days
Weighted Average Exercise Price, Options Outstanding $ 10.73
Number of Shares Vested, Options Exercisable | shares 556
Weighted Average Exercise Price, Options Exercisable $ 10.72
$10.82 - $12.63  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 10.82
Exercise Price Range, Upper Range $ 12.63
Options Outstanding | shares 604
Weighted Average Remaining Contractual Term 4 years 9 months 25 days
Weighted Average Exercise Price, Options Outstanding $ 12.11
Number of Shares Vested, Options Exercisable | shares 394
Weighted Average Exercise Price, Options Exercisable $ 11.96
$12.64 - $14.75  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 12.64
Exercise Price Range, Upper Range $ 14.75
Options Outstanding | shares 490
Weighted Average Remaining Contractual Term 6 years 1 month 2 days
Weighted Average Exercise Price, Options Outstanding $ 13.53
Number of Shares Vested, Options Exercisable | shares 11
Weighted Average Exercise Price, Options Exercisable $ 14.75
$14.76 - $15.23  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 14.76
Exercise Price Range, Upper Range $ 15.23
Options Outstanding | shares 206
Weighted Average Remaining Contractual Term 1 month 27 days
Weighted Average Exercise Price, Options Outstanding $ 15.23
Number of Shares Vested, Options Exercisable | shares 206
Weighted Average Exercise Price, Options Exercisable $ 15.23
$7.40 - $15.23  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 7.40
Exercise Price Range, Upper Range $ 15.23
Options Outstanding | shares 3,902
Weighted Average Remaining Contractual Term 4 years 2 months 4 days
Weighted Average Exercise Price, Options Outstanding $ 10.54
Number of Shares Vested, Options Exercisable | shares 2,746
Weighted Average Exercise Price, Options Exercisable $ 10.18