Quarterly report pursuant to Section 13 or 15(d)

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

v3.6.0.2
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, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income/(loss), beginning balance     $ 109,380  
Other comprehensive income before reclassifications     (283) $ (184)
Amounts reclassified from accumulated other comprehensive loss     674 589
Total other comprehensive income $ 90 $ 124 391 405
Accumulated other comprehensive income/(loss), ending balance 110,941   110,941  
Pension and Other Postretirement Benefits Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income/(loss), beginning balance     (10,932) (9,462)
Amounts reclassified from accumulated other comprehensive loss     674 589
Total other comprehensive income     674 589
Accumulated other comprehensive income/(loss), ending balance (10,258) (8,873) (10,258) (8,873)
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income/(loss), beginning balance     256 406
Other comprehensive income before reclassifications     (283) (184)
Total other comprehensive income     (283) (184)
Accumulated other comprehensive income/(loss), ending balance (27) 222 (27) 222
AOCI Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income/(loss), beginning balance     (10,676) (9,056)
Accumulated other comprehensive income/(loss), ending balance $ (10,285) $ (8,651) $ (10,285) $ (8,651)