Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 103,200 $ 94,164 $ 97,929 $ 96,724
Other comprehensive income before reclassifications     161 155
Amounts reclassified from accumulated other comprehensive loss     353 409
Total other comprehensive income 216 350 514 564
Ending Balance 101,852 96,577 101,852 96,577
Pension and Other Postretirement Benefits Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (7,698) (9,472)
Other comprehensive income before reclassifications     68  
Amounts reclassified from accumulated other comprehensive loss     353 409
Total other comprehensive income     421 409
Ending Balance (7,277) (9,063) (7,277) (9,063)
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     301 (84)
Other comprehensive income before reclassifications     93 155
Total other comprehensive income     93 155
Ending Balance 394 71 394 71
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (7,099) (9,342) (7,397) (9,556)
Ending Balance $ (6,883) $ (8,992) $ (6,883) $ (8,992)