Annual report pursuant to Section 13 and 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
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 96,933 $ 96,494 $ 97,929
Other comprehensive (loss) income before reclassifications (209) (1,515)  
Amounts reclassified from accumulated other comprehensive loss 659 523  
Total other comprehensive income (loss) 450 (992) 926
Ending Balance 105,566 96,933 96,494
Pension and Other Postretirement Benefits Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (7,470) (6,970)  
Other comprehensive (loss) income before reclassifications 35 (1,023)  
Amounts reclassified from accumulated other comprehensive loss 659 523  
Total other comprehensive income (loss) 694 (500)  
Ending Balance (6,776) (7,470) (6,970)
Foreign Currency Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 7 499  
Other comprehensive (loss) income before reclassifications (244) (492)  
Amounts reclassified from accumulated other comprehensive loss 0 0  
Total other comprehensive income (loss) (244) (492)  
Ending Balance (237) 7 499
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (7,463) (6,471) (7,397)
Ending Balance $ (7,013) $ (7,463) $ (6,471)