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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), beginning balance $ (2,388) $ (2,631)
Unrealized losses arising during the period (3,686) (3,115)
Reclassification of realized net losses to net income 487 32
Accumulated other comprehensive income (loss), ending balance (5,587) (5,714)
Accumulated Translation Adjustment
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), beginning balance 15,604 17,559
Unrealized losses arising during the period (3,680) (3,026)
Accumulated other comprehensive income (loss), ending balance 11,924 14,533
Accumulated Defined Benefit Plans Adjustment
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), beginning balance (18,006) [1] (20,236)
Unrealized losses arising during the period     
Reclassification of realized net losses to net income 487 [1]   
Accumulated other comprehensive income (loss), ending balance (17,519) [1] (20,236)
Accumulated Net Unrealized Investment Gain (Loss)
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), beginning balance 14 46
Unrealized losses arising during the period (6) (89)
Reclassification of realized net losses to net income   32
Accumulated other comprehensive income (loss), ending balance $ 8 $ (11)
[1] The tax effects on the reclassifications of realized net losses was $0.3 million for the three months ended July 31, 2014.