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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)

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