Annual report pursuant to Section 13 and 15(d)

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

v3.4.0.3
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income/(loss), beginning balance $ (9,056) $ (5,765)  
Other comprehensive income before reclassifications (2,405) (3,623)  
Amounts reclassified from accumulated other comprehensive loss 785 332  
Total other comprehensive income (1,620) (3,291) $ 2,268
Accumulated other comprehensive income/(loss), ending balance (10,676) (9,056) (5,765)
Pension and Other Postretirement Benefits Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income/(loss), beginning balance (9,462) (6,168)  
Other comprehensive income before reclassifications (2,255) (3,626)  
Amounts reclassified from accumulated other comprehensive loss 785 332  
Total other comprehensive income (1,470) (3,294)  
Accumulated other comprehensive income/(loss), ending balance (10,932) (9,462) (6,168)
Foreign Currency Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income/(loss), beginning balance 406 403  
Other comprehensive income before reclassifications (150) 3  
Total other comprehensive income (150) 3  
Accumulated other comprehensive income/(loss), ending balance $ 256 $ 406 $ 403