Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
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, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 114,110  
Other comprehensive income before reclassifications     216 $ (283)
Amounts reclassified from accumulated other comprehensive loss     619 674
Total other comprehensive income $ 355 $ 90 835 391
Ending Balance 101,935   101,935  
Pension and Other Postretirement Benefits Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (8,439) (10,932)
Amounts reclassified from accumulated other comprehensive loss     619 674
Total other comprehensive income     619 674
Ending Balance (7,820) (10,258) (7,820) (10,258)
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     5 256
Other comprehensive income before reclassifications     216 (283)
Total other comprehensive income     216 (283)
Ending Balance 221 (27) 221 (27)
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (8,434) (10,676)
Ending Balance $ (7,599) $ (10,285) $ (7,599) $ (10,285)