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Retirement Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |  |
Percentage of non-discretionary regular matching contribution of company | 100.00% |
Percentage of eligible compensation of deferral contribution, minimum | 1.00% |
Percentage of eligible compensation | 80.00% |
Percentage of eligible compensation of deferral contribution, maximum | 6.00% |
Matching contribution expense for defined contribution plan | $ 647 | $ 694

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- Definition Percentage of deferral participant contribution. + References No definition available. + Details
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- Definition Percentage of eligible compensation of deferral contribution, maximum. + References No definition available. + Details
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- Definition Percentage of eligible compensation of deferral contribution minimum. + References No definition available. + Details
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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=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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