Quarterly report pursuant to Section 13 or 15(d)

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

v3.6.0.2
Changes in Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before provision for income taxes $ 2,594 $ 1,638 $ 4,420 $ 8,027
Provision for income taxes 754 364 1,198 2,416
Net income 1,840 1,274 3,222 5,611
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 (348) (304) (1,043) (911)
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 (123) (107) (369) (322)
Net income $ (225) $ (197) $ (674) $ (589)