Schedule of Expected Amounts of Net Periodic Benefit Costs (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2016 USD ($)
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (loss) gain	$ (1,821)
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (loss) gain	1,072
Unrecognized prior service credit (cost)	$ 4,346