Stock Based Compensation (Schedule of Stock Options Outstanding and Exercisable) (Details) (Common shares reserved under stock option plans, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	5,351
Options Outstanding, weighted average contractual life (in years)	4 years 2 months 1 day
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 7.51
Options Exercisable, Number of Options Exercisable (in shares)	3,173
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.25
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower range limit	$ 1.50
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, upper range limit	$ 16.08
Stock Options Range of Exercise Prices $1.50 - $2.51
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	1,246
Options Outstanding, weighted average contractual life (in years)	2 years 8 months 5 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 3.28
Options Exercisable, Number of Options Exercisable (in shares)	1,208
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 3.25
Stock Options Range of Exercise Prices $1.50 - $2.51 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower range limit	$ 1.50
Stock Options Range of Exercise Prices $1.50 - $2.51 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, upper range limit	$ 4.34
Stock Options Range of Exercise Prices $2.52 - $4.34
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	1,155
Options Outstanding, weighted average contractual life (in years)	2 years 4 months 24 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 6.81
Options Exercisable, Number of Options Exercisable (in shares)	989
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.73
Stock Options Range of Exercise Prices $2.52 - $4.34 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower range limit	$ 4.35
Stock Options Range of Exercise Prices $2.52 - $4.34 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, upper range limit	$ 7.34
Stock Options Range of Exercise Prices $4.35 - $6.56
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	1,172
Options Outstanding, weighted average contractual life (in years)	5 years 8 months 12 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 8.83
Options Exercisable, Number of Options Exercisable (in shares)	311
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.32
Stock Options Range of Exercise Prices $4.35 - $6.56 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower range limit	$ 7.35
Stock Options Range of Exercise Prices $4.35 - $6.56 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, upper range limit	$ 9.14
Stock Options Range of Exercise Prices $6.57 - $9.06
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	1,300
Options Outstanding, weighted average contractual life (in years)	5 years 5 months 5 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 9.77
Options Exercisable, Number of Options Exercisable (in shares)	449
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.67
Stock Options Range of Exercise Prices $6.57 - $9.06 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower range limit	$ 9.15
Stock Options Range of Exercise Prices $6.57 - $9.06 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, upper range limit	$ 10.42
Stock Options Range of Exercise Prices $9.07 - $16.08
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	478
Options Outstanding, weighted average contractual life (in years)	5 years 1 month 21 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 10.85
Options Exercisable, Number of Options Exercisable (in shares)	216
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.76
Stock Options Range of Exercise Prices $9.07 - $16.08 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower range limit	$ 10.43
Stock Options Range of Exercise Prices $9.07 - $16.08 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, upper range limit	$ 16.08