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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, beginning balance     $ (5,765) $ (8,033)
Other comprehensive income before reclassifications     44 45
Amounts reclassified from accumulated other comprehensive loss     168 286
Total other comprehensive income 123 181 212 331
Accumulated other comprehensive loss, ending balance (5,553) (7,702) (5,553) (7,702)
Pension and Other Postretirement Benefits Items [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, beginning balance     (6,168) (8,443)
Other comprehensive income before reclassifications     0  
Amounts reclassified from accumulated other comprehensive loss     168 286
Total other comprehensive income     168 286
Accumulated other comprehensive loss, ending balance (6,000) (8,157) (6,000) (8,157)
Foreign Currency Items [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, beginning balance     403 410
Other comprehensive income before reclassifications     44 45
Amounts reclassified from accumulated other comprehensive loss     0  
Total other comprehensive income     44 45
Accumulated other comprehensive loss, ending balance $ 447 $ 455 $ 447 $ 455