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

v3.19.2
Changes in Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income before provision for income taxes $ 107 $ 3,025
Provision for income taxes 25 702
Net income 82 2,323
Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Amortization of Actuarial Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income before provision for income taxes (249) (219)
Reclassifications Out of Accumulated Other Comprehensive Loss [Member] | Pension and Other Postretirement Benefits Items [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Provision for income taxes (55) (49)
Net income $ (194) $ (170)