Annual report pursuant to Section 13 and 15(d)

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

v3.21.1
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 96,724 $ 98,966 $ 103,349
Other comprehensive (loss) income before reclassifications 1,331 (1,494)  
Amounts reclassified from accumulated other comprehensive loss 828 771  
Total other comprehensive income (loss) 2,159 (723) (583)
Ending Balance 97,929 96,724 98,966
Pension and Other Postretirement Benefits Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (9,472) (8,947)  
Other comprehensive (loss) income before reclassifications 946 (1,296)  
Amounts reclassified from accumulated other comprehensive loss 828 771  
Total other comprehensive income (loss) 1,774 (525)  
Ending Balance (7,698) (9,472) (8,947)
Foreign Currency Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (84) 114  
Other comprehensive (loss) income before reclassifications 385 (198)  
Total other comprehensive income (loss) 385 (198)  
Ending Balance 301 (84) 114
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (9,556) (8,833) (8,250)
Ending Balance $ (7,397) $ (9,556) $ (8,833)