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Stock-Based Compensation (Exercise Price Range) (Details) - Stock Options
shares in Thousands
12 Months Ended
Sep. 30, 2016
$ / shares
shares
$7.40 - $8.03 [Member]  
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 $ 8.03
Options Outstanding | shares 611
Weighted Average Remaining Contractual Term 4 years 4 months 6 days
Weighted Average Exercise Price, Options Outstanding $ 7.74
Number of Shares Vested, Options Exercisable | shares 460
Weighted Average Exercise Price, Options Exercisable $ 7.85
$8.04 - $9.03 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 8.04
Exercise Price Range, Upper Range $ 9.03
Options Outstanding | shares 627
Weighted Average Remaining Contractual Term 5 years 5 months 26 days
Weighted Average Exercise Price, Options Outstanding $ 8.52
Number of Shares Vested, Options Exercisable | shares 234
Weighted Average Exercise Price, Options Exercisable $ 8.42
$9.04 - $9.68 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 9.04
Exercise Price Range, Upper Range $ 9.68
Options Outstanding | shares 685
Weighted Average Remaining Contractual Term 5 years
Weighted Average Exercise Price, Options Outstanding $ 9.53
Number of Shares Vested, Options Exercisable | shares 662
Weighted Average Exercise Price, Options Exercisable $ 9.53
$9.69 - $10.81 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 9.69
Exercise Price Range, Upper Range $ 10.81
Options Outstanding | shares 830
Weighted Average Remaining Contractual Term 5 years 2 months 26 days
Weighted Average Exercise Price, Options Outstanding $ 10.57
Number of Shares Vested, Options Exercisable | shares 664
Weighted Average Exercise Price, Options Exercisable $ 10.58
$10.82 - $12.63 [Member]  
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 724
Weighted Average Remaining Contractual Term 5 years 1 month 17 days
Weighted Average Exercise Price, Options Outstanding $ 12.10
Number of Shares Vested, Options Exercisable | shares 351
Weighted Average Exercise Price, Options Exercisable $ 11.73
$12.64 - $14.75 [Member]  
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 268
Weighted Average Remaining Contractual Term 4 months 20 days
Weighted Average Exercise Price, Options Outstanding $ 13.47
Number of Shares Vested, Options Exercisable | shares 268
Weighted Average Exercise Price, Options Exercisable $ 13.47
$14.76 - $15.23 [Member]  
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 218
Weighted Average Remaining Contractual Term 1 year 1 month 27 days
Weighted Average Exercise Price, Options Outstanding $ 15.23
Number of Shares Vested, Options Exercisable | shares 218
Weighted Average Exercise Price, Options Exercisable $ 15.23
$7.40 - $15.23 [Member]  
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 3,963
Weighted Average Remaining Contractual Term 4 years 6 months 10 days
Weighted Average Exercise Price, Options Outstanding $ 10.36
Number of Shares Vested, Options Exercisable | shares 2,857
Weighted Average Exercise Price, Options Exercisable $ 10.49