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Pension and Retirement Plans (Detail) - Weighted average actuarial assumptions used to determine projected benefit obligation - Pension Plan
Sep. 30, 2017
Sep. 30, 2016
Domestic    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 3.75% 3.50%
International    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 2.34% 1.77%
Expected return on plan assets: 3.70% 3.60%
Rate of compensation increase: 1.00% 1.00%