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Pension and Retirement Plans (Detail) - Weighted average actuarial assumptions used to determine net periodic benefit cost - Pension Plan
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Domestic    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 3.50% 4.25%
International    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 1.77% 3.10%
Expected return on plan assets: 3.60% 4.20%
Rate of compensation increase: 1.00% 1.00%