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Fair Value Measurements - Narrative (Details) | Sep. 30, 2017 | Sep. 30, 2016
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Fair Value Disclosures [Abstract] |  |
Estimated discount rate | 4.08% | 4.30%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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