Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Description of Defined Contribution Pension and Other Postretirement Plans	Contributions to the profit sharing portion of the Plans are discretionary, ranging from 0% to 3%, and are approved by our Board of Directors.
Profit Sharing Expense	$ 1,847	$ 1,516	$ 1,244
401(k) Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year, Description	We are required to match 50% of the employee’s contribution to the 401(k) portion of the plan up to 6% of the employee’s salary.
Matching Contribution Expense	1,871	1,464	1,108
Centaur Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year, Description	Contributions are currently payable at a minimum of 3% up to a maximum of 6% of eligible pay if matched by employee.
Matching Contribution Expense	$ 250	$ 269	$ 207

Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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