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Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Compensation And Retirement Disclosure [Abstract]    
Investments held in Rabbi Trust $ 8,759 $ 8,811
Unrealized (loss) gains in carrying value of trust assets (95) (208)
Unrealized (loss) gains in carrying value of trust assets are net of income tax expense of (223) (168)
Obligations under the supplemental plan $ 29,108 $ 25,072