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
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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 97,945 $ 103,952 $ 98,966 $ 103,349
Other comprehensive loss before reclassifications     (223) (333)
Amounts reclassified from accumulated other comprehensive loss     389 340
Total other comprehensive income 59 36 166 7
Ending Balance 98,495 105,254 98,495 105,254
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     389 340
Total other comprehensive income     389 340
Ending Balance (8,558) (8,259) (8,558) (8,259)
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     114 349
Other comprehensive loss before reclassifications     (223) (333)
Total other comprehensive income     (223) (333)
Ending Balance (109) 16 (109) 16
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (8,726) (8,279) (8,833) (8,250)
Ending Balance $ (8,667) $ (8,243) $ (8,667) $ (8,243)