Stock-Based Compensation (Stock Options Valuation) (Details) (Stock Options, USD $)	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of period (in shares)	611,384	636,283	691,403
Outstanding at beginning of period, Weighted Average Exercise Price (usd per share)	$ 10.02	$ 7.59	$ 7.03
Granted (in shares)	285,400	155,233	165,499
Granted, Weighted Average Exercise Price (usd per share)	$ 7.98	$ 16.89	$ 8.05
Exercised (in shares)	(600)	(178,882)	(214,094)
Exercised, Weighted Average Exercise Price (usd per share)	$ 5.33	$ 7.35	$ 6.19
Forfeited (in shares)	(4,891)	(1,250)	(6,525)
Forfeited, Weighted Average Exercise Price (usd per share)	$ 9.50	$ 6.94	$ 5.70
Outstanding at end of period (in shares)	891,293	611,384	636,283
Outstanding at end of period, Weighted Average Exercise Price (usd per share)	$ 9.37	$ 10.02	$ 7.59
Exercisable at end of period (in shares)	400,638	232,018	259,595
Exercisable at end of period, Weighted Average Exercise Price (usd per share)	$ 9.25	$ 8.31	$ 7.97
Weighted average fair value of options granted during the period (usd per share)	$ 4.95	$ 10.57	$ 4.98

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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

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