v3.26.1
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 140,315 $ 119,577
Other comprehensive income before reclassifications 61 50
Amounts reclassified from accumulated other comprehensive loss 132 162
Total other comprehensive income 193 212
Ending Balance 192,196 123,384
Pension and Other Postretirement Benefits Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (5,584) (6,671)
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss 132 162
Total other comprehensive income 132 162
Ending Balance (5,452) (6,509)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (265) (316)
Other comprehensive income before reclassifications 61 50
Amounts reclassified from accumulated other comprehensive loss 0 0
Total other comprehensive income 61 50
Ending Balance (204) (266)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (5,849) (6,987)
Ending Balance $ (5,656) $ (6,775)