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Schedule of Fair Values of Defined Benefit Plans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans $ 33,412 $ 26,410 $ 21,424
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 16,533 18,375  
Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 15,799 7,166  
Real Estate Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 163 147  
Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 704 258  
Commodity Linked Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans $ 213 $ 464