Annual report pursuant to Section 13 and 15(d)

Long-Lived Assets, Excluding Financial Instruments and Tax Assets, Classified by Controlling Countries over Ten Percent (Detail)

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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, 2013
Apr. 30, 2012
Apr. 30, 2011
Segment Reporting Information [Line Items]      
Long-lived assets $ 53,628 [1] $ 49,808 [1] $ 43,142 [1]
UNITED STATES
      
Segment Reporting Information [Line Items]      
Long-lived assets 40,200 [2] 33,559 [2] 30,539 [2]
UNITED KINGDOM
      
Segment Reporting Information [Line Items]      
Long-lived assets 2,982 3,741 4,323
Other Countries
      
Segment Reporting Information [Line Items]      
Long-lived assets $ 10,446 $ 12,508 $ 8,280
[1] As of the end of the fiscal year.
[2] Includes Corporate long-lived assets