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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, 2018
Sep. 30, 2017
Domestic    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 3.75% 3.50%
International    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 2.80% 2.40%
Expected return on plan assets: 3.70% 3.60%
Rate of compensation increase: 0.00% 0.00%