Quarterly report [Sections 13 or 15(d)]

Changes in Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Loss by Component (Detail)

v3.25.3
Changes in Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before benefit for income taxes $ 4,223 $ 4,297 $ 9,236 $ 7,591
Provision for income taxes 1,133 1,016 1,551 1,344
Net Income (Loss) 3,090 3,281 7,685 6,247
Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Amortization of Actuarial income (loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before benefit for income taxes [1] 210 195 420 390
Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Pension and Other Postretirement Benefits Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Provision for income taxes 49 45 97 90
Net Income (Loss) $ 161 $ 150 $ 323 $ 300
[1] These accumulated other comprehensive loss components are included within the computation of pension and other postretirement benefit costs.