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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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