Stock-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Jun. 30, 2012
Aggregate option activity
Vested and exercisable at September 30, 2011, Number of Share Options	43
Options exercised, Number of Share Options	(40)
Vested and exercisable at June 30, 2012, Number of Share Options	3
Vested and exercisable at September 30, 2011, Weighted-Average Exercise Price	$ 3.86
Options exercised, Weighted-Average Exercise Price	$ 3.87
Vested and exercisable at June 30, 2012, Weighted-Average Exercise Price	$ 3.74
Vested and exercisable at June 30, 2012, Weighted-Average Remaining Contractual Term (Years)	3 years
Vested and exercisable at June 30, 2012, Aggregate Intrinsic Value	$ 58

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

+ References

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

+ References

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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