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Stock-Based Compensation (Exercise Price Range) (Details) - Stock Options
shares in Thousands
12 Months Ended
Sep. 30, 2015
$ / 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 777
Weighted Average Remaining Contractual Term 5 years 3 months 25 days
Weighted Average Exercise Price, Options Outstanding $ 7.74
Number of Shares Vested, Options Exercisable | shares 439
Weighted Average Exercise Price, Options Exercisable $ 8.01
$8.04 - $9.35 [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 $ 9.35
Options Outstanding | shares 1,006
Weighted Average Remaining Contractual Term 6 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding $ 8.79
Number of Shares Vested, Options Exercisable | shares 521
Weighted Average Exercise Price, Options Exercisable $ 8.98
$9.36 - $9.95 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 9.36
Exercise Price Range, Upper Range $ 9.95
Options Outstanding | shares 751
Weighted Average Remaining Contractual Term 4 years 11 months 8 days
Weighted Average Exercise Price, Options Outstanding $ 9.69
Number of Shares Vested, Options Exercisable | shares 709
Weighted Average Exercise Price, Options Exercisable $ 9.69
$9.96 - $10.81 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 9.96
Exercise Price Range, Upper Range $ 10.81
Options Outstanding | shares 1,119
Weighted Average Remaining Contractual Term 6 years 18 days
Weighted Average Exercise Price, Options Outstanding $ 10.66
Number of Shares Vested, Options Exercisable | shares 724
Weighted Average Exercise Price, Options Exercisable $ 10.68
$10.82 - $13.41 [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 $ 13.41
Options Outstanding | shares 883
Weighted Average Remaining Contractual Term 2 years
Weighted Average Exercise Price, Options Outstanding $ 12.41
Number of Shares Vested, Options Exercisable | shares 883
Weighted Average Exercise Price, Options Exercisable $ 12.41
$13.42 - $14.75 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range 13.42
Exercise Price Range, Upper Range $ 14.75
Options Outstanding | shares 27
Weighted Average Remaining Contractual Term 3 years 2 months 19 days
Weighted Average Exercise Price, Options Outstanding $ 14.35
Number of Shares Vested, Options Exercisable | shares 27
Weighted Average Exercise Price, Options Exercisable $ 14.35
$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 237
Weighted Average Remaining Contractual Term 2 years 18 days
Weighted Average Exercise Price, Options Outstanding $ 15.23
Number of Shares Vested, Options Exercisable | shares 237
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 4,800
Weighted Average Remaining Contractual Term 4 years 9 months 21 days
Weighted Average Exercise Price, Options Outstanding $ 10.21
Number of Shares Vested, Options Exercisable | shares 3,540
Weighted Average Exercise Price, Options Exercisable $ 10.66