Schedule of Expected Amounts of Net Periodic Benefit Costs (Detail) $ in Thousands	12 Months Ended
Mar. 31, 2017 USD ($)
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (loss) gain	$ (2,295)
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (loss) gain	993
Unrecognized prior service credit	$ 2,780

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

No definition available.

Name:	us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration