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Marketable Securities (Summary Of Marketable Securities) (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2012
Apr. 30, 2011
Schedule Of Marketable Securities [Line Items]    
Trading $ 82,176 [1],[2] $ 71,363 [1],[2]
Less: current portion of marketable securities, Trading (7,613) [1],[2] (5,081) [1],[2]
Non-current marketable securities, Trading 74,563 [1],[2] 66,282 [1],[2]
Available-for-Sale 53,558 [2],[3] 50,868 [2],[3]
Less: current portion of marketable securities, Available-for-Sale (33,323) [2],[3] (15,787) [2],[3]
Non-current marketable securities, Available-for-Sale 20,235 [2],[3] 35,081 [2],[3]
Total 135,734 122,231
Less: current portion of marketable securities (40,936) (20,868)
Non-current marketable securities 94,798 101,363
Mutual Funds [Member]
    
Schedule Of Marketable Securities [Line Items]    
Trading 82,176 [1],[2] 71,363 [1],[2]
Total 82,176 71,363
Corporate Bonds [Member]
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 44,563 [2],[3] 40,444 [2],[3]
Total 44,563 40,444
Commercial Paper [Member]
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 5,989 [2],[3] 1,000 [2],[3]
Total 5,989 1,000
U.S. Treasury And Agency Securities [Member]
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 3,006 [2],[3] 9,424 [2],[3]
Total $ 3,006 $ 9,424
[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.
[3] These securities represent excess cash invested, under our investment policy, with a professional money manager.