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Nature Of Business And Summary Of Significant Accounting Policies (Schedule Of Options And Restricted Stock Units Excluded From Computation Of Diluted Net Income Per Share) (Details) (USD $)
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12 Months Ended | ||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2010
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| Nature Of Business And Summary Of Significant Accounting Policies [Abstract] | |||
| Quantity of option shares not included | 123,105 | 105,819 | 270,916 |
| Weighted-average exercise price | $ 12.30 | $ 5.18 | $ 4.46 |