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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Schedule Of Income Taxes [Line Items]    
Undistributed earning of foreign subsidiaries $ 203,800,000  
Benefit resulted from audit (2,600,000)  
Unrecognized tax benefits liability 2,701,000 3,400,000
Unrecognized tax benefits, reductions resulting from resolution (1,000,000)  
Unrecognized tax benefits, accrued interest and penalties 700,000 0
Unrecognized tax benefits, interest 100,000 0
Internal Revenue Service (IRS)
    
Schedule Of Income Taxes [Line Items]    
Net operating loss carryforward 12,200,000 20,400,000
Net operating loss carryforward, beginning expiration 2028  
State and Local Jurisdiction
    
Schedule Of Income Taxes [Line Items]    
Net operating loss carryforward 30,200,000  
Net operating loss carryforward, beginning expiration 2015  
Foreign Tax Authority
    
Schedule Of Income Taxes [Line Items]    
Net operating loss carryforward $ 98,200,000  
Net operating loss carryforward, beginning expiration 2015