The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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 weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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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.

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Stock Based Compensation (Summary Of Stock Options Outstanding And Exercisable) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011 years	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2008
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding	906,964	919,639	841,991	912,879
Weighted Average Remaining Contractual Life (in years), Outstanding	7.44
Weighted Average Exercise Price per Share, Outstanding	$ 15.09	$ 15.08	$ 14.69	$ 13.10
Aggregate Intrinsic Value, Outstanding	$ 57
Number of Options Exercisable	772,276
Weighted Average Remaining Contractual Life (in years), Exercisable	7.14
Weighted Average Exercise Price per Share, Exercisable	$ 15.05
Aggregate Intrinsic Value, Exercisable	57
Exercise Price - $4.07 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 4.07
Number of Options Outstanding	8,783
Weighted Average Remaining Contractual Life (in years), Outstanding	3.55
Weighted Average Exercise Price per Share, Outstanding	$ 4.07
Aggregate Intrinsic Value, Outstanding	57
Number of Options Exercisable	8,783
Weighted Average Remaining Contractual Life (in years), Exercisable	3.55
Weighted Average Exercise Price per Share, Exercisable	$ 4.07
Aggregate Intrinsic Value, Exercisable	$ 57
Exercise Price - $6.19 - $8.69 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 6.19
Exercise Price Range, Upper Range Limit	$ 8.69
Exercise Price - $10.86 - $12.71 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 10.86
Exercise Price Range, Upper Range Limit	$ 12.71
Number of Options Outstanding	6,550
Weighted Average Remaining Contractual Life (in years), Outstanding	4.95
Weighted Average Exercise Price per Share, Outstanding	$ 11.42
Number of Options Exercisable	4,926
Weighted Average Remaining Contractual Life (in years), Exercisable	1.93
Weighted Average Exercise Price per Share, Exercisable	$ 11.61
Exercise Price - $13.33 - $17.59 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 13.33
Exercise Price Range, Upper Range Limit	$ 17.59
Number of Options Outstanding	839,601
Weighted Average Remaining Contractual Life (in years), Outstanding	7.52
Weighted Average Exercise Price per Share, Outstanding	$ 14.98
Number of Options Exercisable	727,349
Weighted Average Remaining Contractual Life (in years), Exercisable	7.23
Weighted Average Exercise Price per Share, Exercisable	$ 15.03
Exercise Price $19.19 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Upper Range Limit	$ 19.19
Number of Options Outstanding	52,030
Weighted Average Remaining Contractual Life (in years), Outstanding	7.08
Weighted Average Exercise Price per Share, Outstanding	$ 19.19
Number of Options Exercisable	31,218
Weighted Average Remaining Contractual Life (in years), Exercisable	7.08
Weighted Average Exercise Price per Share, Exercisable	$ 19.19