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Marketable Securities (Assets Measured At Fair Value On Recurring Basis Using Significant Unobservable Inputs) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year $ 71,363 [1],[2]    
Realized gain included in operations 1,013 7,599 11,137
Sale of securities (43,181) (28,618) (13,374)
Balance, end of year 82,176 [1],[2] 71,363 [1],[2]  
Auction Rate Securities [Member]
      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year   8,200  
Auction rate securities put option   (745)  
Realized gain included in operations   745  
Sale of securities   $ (8,200)  
[1] These investments are held in trust for settlement of the Company's obligations of $82.6 million and $72.1 million as of April 30, 2012 and 2011, respectively, under the Executive Capital Accumulation Plan (see Note 6 - Deferred Compensation and Retirement Plans). The fair value of marketable securities classified as trading (held in trust to satisfy obligations under the ECAP) increased by $1.1 million and $7.6 million during fiscal 2012 and fiscal 2011, respectively, recorded in other (loss) income, net on the consolidated statements of income.
[2] The Company's financial assets measured at fair value on a recurring basis include, trading securities classified as Level 1 and available-for-sale securities classified as Level 2. As of April 30, 2012 and 2011, the Company had cash equivalents, including restricted cash of $70.6 million and $120.8 million, respectively, also classified as Level 1.