Quarterly report pursuant to Section 13 or 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
3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at April 1, 2013     $ (8,033)  
Other comprehensive income before reclassifications     45  
Amounts reclassified from accumulated other comprehensive loss     286  
Total other comprehensive income 181 147 331 275
Balance at September 30, 2013 (7,702)   (7,702)  
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         
Amounts reclassified from accumulated other comprehensive loss     286  
Total other comprehensive income     286  
Balance at September 30, 2013 (8,157)   (8,157)  
Foreign Currency Items [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at April 1, 2013     410  
Other comprehensive income before reclassifications     45  
Amounts reclassified from accumulated other comprehensive loss         
Total other comprehensive income     45  
Balance at September 30, 2013 $ 455   $ 455