Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit Plans - Components of Postretirement Benefit Cost and Pension Cost (Detail)

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Employee Benefit Plans - Components of Postretirement Benefit Cost and Pension Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Pension Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 93 $ 115 $ 280 $ 346
Interest cost 296 303 894 909
Expected return on assets (681) (628) (2,045) (1,885)
Amortization of actuarial loss 265 259 707 779
Net pension cost and postretirement benefit cost (27) 49 (164) 149
Other Postretirement Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 3 4 10 13
Amortization of actuarial loss 6 7 18 20
Net pension cost and postretirement benefit cost $ 9 $ 11 $ 28 $ 33