Annual report pursuant to Section 13 and 15(d)

Valuation And Qualifying Accounts (Detail)

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Valuation And Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Allowance for Doubtful Accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 9,437 $ 9,977 $ 5,983
Charges to Cost and Expenses 6,748 5,732 7,650
Charges to Other Accounts (118) [1] (220) [1] 413 [1]
Deductions (6,970) [2] (6,052) [2] (4,069) [2]
Balance at End of Period 9,097 9,437 9,977
Valuation Allowance of Deferred Tax Assets
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 25,089 26,168 21,037
Charges to Cost and Expenses 5,678 443 15,689
Deductions (3,036) [2] (1,522) [2] (10,558) [2]
Balance at End of Period $ 27,731 $ 25,089 $ 26,168
[1] Exchange rate fluctuations.
[2] Allowance for doubtful accounts represents accounts written-off, net of recoveries and deferred tax asset valuation represents release of prior valuation allowances.