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Components of Net Periodic Cost (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Service Cost - Benefits Earned During the Period		$ 399	$ 710	$ 1,001
Interest Cost of Projected Benefit Obligation		1,347	1,466	1,584
Expected Return on Plan Assets		(1,853)	(2,137)	(1,606)
Recognized Net Actuarial Loss		230	566	1,712
Amortization of Prior-Service Cost		61	269	359
Settlement	$ 600		649
Net Periodic Pension Cost		$ 184	$ 1,523	$ 3,050

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