Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 103,349 $ 114,110 $ 109,380
Other comprehensive income before reclassifications (1,316) 1,195  
Amounts reclassified from accumulated other comprehensive loss 733 817  
Total other comprehensive (loss) income (583) 2,012 2,242
Ending Balance 98,966 103,349 114,110
Pension and Other Postretirement Benefits Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (8,599) (8,439)  
Other comprehensive income before reclassifications (1,081) 851  
Amounts reclassified from accumulated other comprehensive loss 733 817  
Total other comprehensive (loss) income (348) 1,668  
Amounts reclassified from accumulated other comprehensive loss to retained earnings   (1,828)  
Ending Balance (8,947) (8,599) (8,439)
Foreign Currency Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 349 5  
Other comprehensive income before reclassifications (235) 344  
Total other comprehensive (loss) income (235) 344  
Ending Balance 114 349 5
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (8,250) (8,434) (10,676)
Amounts reclassified from accumulated other comprehensive loss to retained earnings   (1,828)  
Ending Balance $ (8,833) $ (8,250) $ (8,434)