Retirement Plans - Summary of Recognized Components of Net Periodic Pension Cost Included in Accumulated Other Comprehensive Income (Detail) $ in Thousands	12 Months Ended
Mar. 31, 2017 USD ($)
Compensation and Retirement Disclosure [Abstract]
Prior service cost	$ (42)
Net loss	(1,633)
Net amount expected to be recognized	$ (1,675)

Amount included in accumulated other comprehensive income (AOCI) 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, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

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