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Retirement Plans - Significant Assumptions Used to Determine Projected Benefit Obligations (Detail)
Mar. 31, 2019
Mar. 31, 2018
United States Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.80% 3.90%
International Plans | Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 1.00% 1.40%
Rate of compensation increase 2.00% 1.80%
International Plans | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 2.70% 3.30%
Rate of compensation increase 4.00% 4.00%