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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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Stock-Based Compensation (Stock Options Outstanding) (Details) (Stock Options, USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	1,059,567	891,293	611,384	636,283
Remaining Contractual Life (in years)	7 years 3 months 18 days
Average Exercise Price	$ 6.71	$ 9.37	$ 10.02	$ 7.59
Aggregate Intrinsic Value	$ 1,933
Number Outstanding - Vested and expected to vest	1,057,477
Remaining Contractual Life - Vested and expected to vest	6 years 8 months 19 days
Average Exercise Price - Vested and expected to vest	$ 7.29
Aggregate Intrinsic Value - Vested and expected to vest	1,925
Exercisable at end of period (in shares)	874,591	400,638	232,018
Exercisable at end of period, weighted average exercise price (usd per share)	$ 7.13	$ 9.25	$ 8.31
Aggregate intrinsic value	1,255
2.95-3.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	305,050
Remaining Contractual Life (in years)	9 years 2 months 9 days
Average Exercise Price	$ 2.95
Aggregate Intrinsic Value	1,327
Exercisable at end of period (in shares)	149,087
Exercisable at end of period, weighted average exercise price (usd per share)	$ 2.95
Aggregate intrinsic value	649
2.95-3.00 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 3
2.95-3.00 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 2.95
3.01-7.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	271,683
Remaining Contractual Life (in years)	5 years 1 month 24 days
Average Exercise Price	$ 5.07
Aggregate Intrinsic Value	606
Exercisable at end of period (in shares)	271,683
Exercisable at end of period, weighted average exercise price (usd per share)	$ 5.07
Aggregate intrinsic value	606
3.01-7.00 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 7
3.01-7.00 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 3.01
7.01-8.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	295,920
Remaining Contractual Life (in years)	7 years 10 months 24 days
Average Exercise Price	$ 7.94
Aggregate Intrinsic Value	0
Exercisable at end of period (in shares)	295,920
Exercisable at end of period, weighted average exercise price (usd per share)	$ 7.94
Aggregate intrinsic value	0
7.01-8.00 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 8
7.01-8.00 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 7.01
8.01-15.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	113,087
Remaining Contractual Life (in years)	5 years 10 months 24 days
Average Exercise Price	$ 10.49
Aggregate Intrinsic Value	0
Exercisable at end of period (in shares)	98,775
Exercisable at end of period, weighted average exercise price (usd per share)	$ 10.48
8.01-15.00 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 15
8.01-15.00 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 8.01
15.01-23.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	73,827
Remaining Contractual Life (in years)	7 years 1 month 6 days
Average Exercise Price	$ 17.54
Aggregate Intrinsic Value	0
Exercisable at end of period (in shares)	59,126
Exercisable at end of period, weighted average exercise price (usd per share)	$ 17.47
Aggregate intrinsic value	$ 0
15.01-23.00 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 23
15.01-23.00 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Exercise Price	$ 15.01