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Weighted Average Actuarial Assumptions (Detail) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
U.S. Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected long-term rate of return on plan assets | [1] | 7.00% | 7.00% | 7.00%
Rate of increase in compensation levels for: |  |  |  |
Benefit obligation | [2] |  |  | 4.00%
Net periodic benefit cost | [2] |  |  | 4.00%
Non-U.S. Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected long-term rate of return on plan assets | [1] | 4.50% | 3.92% |
Rate of increase in compensation levels for: |  |  |  |
Benefit obligation | [2] | 3.20% | 3.20% |
Net periodic benefit cost | [2] | 3.20% | 3.00% |
Other Postretirement Benefits | U.S. Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Discount rate for benefit obligation | [3] | 2.44% | 1.91% | 2.43%
Discount rate for net periodic benefit cost |  | 1.91% | 2.43% | 2.59%
Pension Benefits | U.S. Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Discount rate for benefit obligation | [3] | 3.84% | 3.62% | 4.33%
Discount rate for net periodic benefit cost |  | 3.62% | 4.33% | 4.27%
Pension Benefits | Non-U.S. Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Discount rate for benefit obligation | [3] | 2.70% | 2.40% |
Discount rate for net periodic benefit cost |  | 2.40% | 3.10% |
[1] | Primarily based on the targeted allocation, and evaluated for reasonableness by considering such factors as: (i) actual return on plan assets; (ii) historical rates of return on various asset classes in the portfolio; (iii) projections of returns on various asset classes; and (iv) current and prospective capital market conditions and economic forecasts.
[2] | This assumption is not applicable for the U.S. plans in fiscal 2017 and 2016 due to the amendment of the U.S. qualified defined benefit pension plan in October 2015, which discontinued the employer provided credits effective after December 31, 2015.
[3] | Represents a single weighted-average discount rate derived based on a cash flow matching analysis, with the projected benefit payments matching spot rates from a yield curve developed from high-quality corporate bonds.

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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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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost 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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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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