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Long-Lived Assets, Excluding Financial Instruments and Tax Assets, Classified by Controlling Countries over Ten Percent (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Segment Reporting Information [Line Items]      
Long-lived assets $ 60,434 [1] $ 53,628 [1] $ 49,808 [1]
UNITED STATES
      
Segment Reporting Information [Line Items]      
Long-lived assets 47,411 [2] 40,200 [2] 33,559 [2]
Other Countries
      
Segment Reporting Information [Line Items]      
Long-lived assets $ 13,023 $ 13,428 $ 16,249
[1] As of the end of the fiscal year.
[2] Includes Corporate long-lived assets