v3.7.0.1
Retirement Plans - Pension Components Before Tax and Related Changes Net of Tax Recognized in AOCI (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]      
Prior service cost $ 377 $ 445 $ 800
Net loss (28,475) (26,628) (28,734)
Net amount recognized $ 28,852 $ 27,073 $ 29,534