Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3.a.u2
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, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 98,495 $ 105,254 $ 98,966 $ 103,349
Other comprehensive loss before reclassifications     (135) (323)
Amounts reclassified from accumulated other comprehensive loss     583 510
Total other comprehensive income 282 180 448 187
Ending Balance 98,041 104,809 98,041 104,809
Pension and Other Postretirement Benefits Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (8,947) (8,599)
Amounts reclassified from accumulated other comprehensive loss     583 510
Total other comprehensive income     583 510
Ending Balance (8,364) (8,089) (8,364) (8,089)
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     114 349
Other comprehensive loss before reclassifications     (135) (323)
Total other comprehensive income     (135) (323)
Ending Balance (21) 26 (21) 26
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (8,667) (8,243) (8,833) (8,250)
Ending Balance $ (8,385) $ (8,063) $ (8,385) $ (8,063)