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Employee 401(k) Profit Sharing Plans - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Compensation And Retirement Disclosure [Abstract] |  |  |
Duration of profit sharing plan | 90 days |  |
Introductory period of profit sharing | April 1 or October 1 |  |
Employees eligibility age for participating in profit sharing plan | 21 years |  |
Total participants contributions in Profit sharing plan | 25.00% |  |
Maximum of each participants compensation | 5.00% |  |
Contribution under the Profit sharing plan | $ 765 | $ 713 | $ 605

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- Definition Duration of profit sharing plan. + References No definition available. + Details
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- Definition Employees eligibility age for participating in profit sharing plan. + References No definition available. + Details
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- Definition Introductory period of profit sharing plan. + 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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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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