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401(k) and Employee Stock Ownership Plan (Details) (USD $) | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Annual Employee Additional Contribution Threshold, Percentage of Base Salary | 100.00% |  |
Annual Employee Additional Contribution, Maximum Allowable Contribution | $ 49,000 |  |
Term for Employees to Become Fully Vested | 6 years |  |
Company contributions to plan | $ 5,400,000 | $ 5,400,000 | $ 4,800,000

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Maximum amount per employee, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Term for Employees to Become Fully Vested + References No definition available. + Details
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