Quarterly report pursuant to Section 13 or 15(d)

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

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Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 105,566 $ 96,933
Other comprehensive income before reclassifications (28) (252)
Amounts reclassified from accumulated other comprehensive loss 150 164
Total other comprehensive income (loss) 122 (88)
Ending Balance 108,188 99,721
Pension and Other Postretirement Benefits Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (6,776) (7,470)
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss 150 164
Total other comprehensive income (loss) 150 164
Ending Balance (6,626) (7,306)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (237) 7
Other comprehensive income before reclassifications (28) (252)
Amounts reclassified from accumulated other comprehensive loss 0 0
Total other comprehensive income (loss) (28) (252)
Ending Balance (265) (245)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (7,013) (7,463)
Ending Balance $ (6,891) $ (7,551)