Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.4
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 96,577 $ 98,495 $ 96,724 $ 98,966
Other comprehensive income before reclassifications     416 (135)
Amounts reclassified from accumulated other comprehensive loss     614 583
Total other comprehensive income 466 282 1,030 448
Ending Balance 97,333 98,041 97,333 98,041
Pension and Other Postretirement Benefits Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (9,472) (8,947)
Amounts reclassified from accumulated other comprehensive loss     614 583
Total other comprehensive income     614 583
Ending Balance (8,858) (8,364) (8,858) (8,364)
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (84) 114
Other comprehensive income before reclassifications     416 (135)
Total other comprehensive income     416 (135)
Ending Balance 332 (21) 332 (21)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (8,992) (8,667) (9,556) (8,833)
Ending Balance $ (8,526) $ (8,385) $ (8,526) $ (8,385)