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Weighted Average Actuarial Assumptions (Detail)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
U.S. Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate for benefit obligation [1] 3.62% 4.33% 4.27%
Discount rate for net periodic benefit cost 4.33% 4.27% 4.81%
Non-U.S. Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate for benefit obligation [1] 2.40%    
Discount rate for net periodic benefit cost 3.10%    
Expected long-term rate of return on plan assets [2] 3.92%    
Rate of increase in compensation levels for:      
Benefit obligation 3.20%    
Net periodic benefit cost 3.00%    
U.S. Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate for benefit obligation [1] 1.91% 2.43% 2.59%
Discount rate for net periodic benefit cost 2.43% 2.59% 2.76%
Expected long-term rate of return on plan assets [2] 7.00% 7.00% 7.00%
Rate of increase in compensation levels for:      
Benefit obligation   4.00% 4.00%
Net periodic benefit cost   4.00% 4.50%
[1] 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.
[2] 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.