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Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Apr. 30, 2012
Schedule Of Marketable Securities [Line Items]    
Trading $ 91,145 [1],[2] $ 82,176 [1],[2]
Less: current portion of marketable securities (4,198) [1],[2] (7,613) [1],[2]
Non-current marketable securities, Trading 86,947 [1],[2] 74,563 [1],[2]
Available-for-Sale 45,402 [2],[3] 53,558 [2],[3]
Less: current portion of marketable securities (26,823) [2],[3] (33,323) [2],[3]
Non-current marketable securities, Available-for-Sale 18,579 [2],[3] 20,235 [2],[3]
Total 136,547 135,734
Less: current portion of marketable securities (31,021) (40,936)
Non-current marketable securities 105,526 94,798
Mutual Funds
    
Schedule Of Marketable Securities [Line Items]    
Trading 91,145 [1],[2] 82,176 [1],[2]
Total 91,145 82,176
Corporate Bonds
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 38,400 [2],[3] 44,563 [2],[3]
Total 38,400 44,563
Commercial Paper
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 3,997 [2],[3] 5,989 [2],[3]
Total 3,997 5,989
U.S. Treasury And Agency Securities
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 3,005 [2],[3] 3,006 [2],[3]
Total $ 3,005 $ 3,006
[1] These investments are held in trust for settlement of the Company's obligations of $91.6 million and $82.6 million as of July 31, 2012 and April 30, 2012, respectively, under the Executive Capital Accumulation Plan ("ECAP") (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) decreased by $0.8 million and $1.6 million during the three months ended July 31, 2012 and 2011, respectively, recorded in other loss, net on the consolidated statements of income. The remaining activity is comprised primarily of Company and employee contributions made of $17.5 million and $1.3 million, respectively, offset by distributions of $9.0 million for the three months ended July 31, 2012.
[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 July 31, 2012 and April 30, 2012, the Company had cash equivalents of $55.1 million and $60.5 million, respectively, and restricted cash in both periods of $10.1 million classified as Level 1.
[3] These securities represent excess cash invested, under our investment policy, with a professional money manager.