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Schedule of Fair Values of Defined Benefit Plans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans $ 36,541 $ 33,412 $ 26,410
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 4,525 16,533  
Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 31,516 15,799  
Real Estate Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 144 163  
Commodity Linked Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 212 213  
Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans $ 144 $ 704