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401(k) and Employee Stock Ownership Plan (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |  |
Employee contribution, percentage of annual salary |  | 100.00% |  |
Employee contribution, maximum allowable contribution |  | $ 52,000 |  |
Term for employees to become fully vested |  | 6 years |  |
Employer matching contribution percent | 100.00% |  |  |
Percent of employees' gross pay | 4.00% |  |  |
Profit sharing contribution, percent | 7.00% |  |  |
Company contributions to plan |  | $ 7,314,000 | $ 5,870,000 | $ 5,400,000

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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 + Details
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