Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Summary of Increase (Decrease) in Accumulated Other Comprehensive Loss, Net of Income Tax (Detail)

v3.4.0.3
Employee Benefit Plans - Summary of Increase (Decrease) in Accumulated Other Comprehensive Loss, Net of Income Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Total $ 1,470 $ 3,294 $ (2,275)
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss arising during the year 2,280 3,578  
Amortization of actuarial loss (759) (375)  
Amortization of prior service cost   (3)  
Total 1,521 3,200  
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss arising during the year (26) 48  
Amortization of actuarial loss (25) (23)  
Amortization of prior service cost   69  
Total $ (51) $ 94