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Schedule of Fair Values of Defined Benefit Plans Determined Using Fair Value Hierarchy of Inputs (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans $ 21,424 $ 22,055 $ 21,189
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 14,083 13,510  
Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 7,047 7,985  
Real Estate Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 129 133  
Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 115 303  
Commodity Linked Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 50 124  
Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 115 303  
Fair Value, Inputs, Level 1 | Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 115 303  
Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 21,309 21,752  
Fair Value, Inputs, Level 2 | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 14,083 13,510  
Fair Value, Inputs, Level 2 | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 7,047 7,985  
Fair Value, Inputs, Level 2 | Real Estate Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans 129 133  
Fair Value, Inputs, Level 2 | Commodity Linked Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of defined benefit plans $ 50 $ 124