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401(k) and Employee Stock Ownership Plan (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Compensation and Retirement Disclosure [Abstract] |  |  |
Annual Employee Additional Contribution Threshold, Percentage of Base Salary | 100.00% |  |
Annual Employee Additional Contribution, Maximum Allowable Contribution | $ 49 |  |
Term for Employees to Become Fully Vested | 6 years |  |
Company contributions to plan | $ 5,870 | $ 5,400 | $ 5,400

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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