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401(k) Plan and Employee Stock Ownership Plan (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
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 |  |
Defined Contribution Plan, Cost Recognized | $ 5,400 | $ 4,800 | $ 4,200

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: 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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