Stock Based Compensation (Schedule of Stock Options Outstanding and Exercisable) (Details) (Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	5,477
Options Outstanding, weighted average contractual life (in years)	4 years 4 months 10 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 6.81
Options Exercisable, Number of Options Exercisable (in shares)	3,072
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.42
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	759
Options Outstanding, weighted average contractual life (in years)	3 years 1 month 10 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 2.02
Options Exercisable, Number of Options Exercisable (in shares)	685
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 1.99
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	$ 2.51
Stock Options Range of Exercise Prices $2.52 - $4.34
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	899
Options Outstanding, weighted average contractual life (in years)	3 years 10 months 6 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 4.21
Options Exercisable, Number of Options Exercisable (in shares)	606
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.17
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	$ 2.52
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	$ 4.34
Stock Options Range of Exercise Prices $4.35 - $6.56
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	842
Options Outstanding, weighted average contractual life (in years)	1 year 8 months 26 days
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 6.01
Options Exercisable, Number of Options Exercisable (in shares)	839
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.01
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	$ 4.35
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	$ 6.56
Stock Options Range of Exercise Prices $6.57 - $9.06
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	1,100
Options Outstanding, weighted average contractual life (in years)	4 years 5 months 1 day
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 7.36
Options Exercisable, Number of Options Exercisable (in shares)	644
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 7.30
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	$ 6.57
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	$ 9.06
Stock Options Range of Exercise Prices $9.07 - $16.08
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, shares	1,877
Options Outstanding, weighted average contractual life (in years)	6 years 3 months
Options Outstanding, Weighted average Exercise Price (in dollars per share)	$ 10.03
Options Exercisable, Number of Options Exercisable (in shares)	298
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.15
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	$ 9.07
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

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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