Annual report pursuant to Section 13 and 15(d)

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

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Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at April 1, 2013 $ (8,033)    
Other comprehensive income before reclassifications 1,695    
Amounts reclassified from accumulated other comprehensive loss 573    
Total other comprehensive income 2,268 127 (3,148)
Balance at March 31, 2014 (5,765) (8,033)  
Pension and Other Postretirement Benefits Items [Member]
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at April 1, 2013 (8,443)    
Other comprehensive income before reclassifications 1,702    
Amounts reclassified from accumulated other comprehensive loss 573    
Total other comprehensive income 2,275    
Balance at March 31, 2014 (6,168)    
Foreign Currency Items [Member]
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at April 1, 2013 410    
Other comprehensive income before reclassifications (7)    
Amounts reclassified from accumulated other comprehensive loss       
Total other comprehensive income (7)    
Balance at March 31, 2014 $ 403