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Employee Benefits Plans - Profit Sharing and 401K (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Retirement Benefits [Abstract] |  |  |
Matching contribution (as a percent) (up to) | 4.00% |  |
Contribution to plan | $ 445,000 | $ 401,000 | $ 360,000
Contribution to profit sharing plan | $ 378,000 | $ 291,000 | $ 165,000

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- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + 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=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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