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Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Apr. 30, 2013
Schedule Of Marketable Securities [Line Items]    
Trading $ 116,207 [1],[2] $ 98,001 [1],[2]
Less: current portion of marketable securities (4,510) [1],[2] (4,537) [1],[2]
Non-current marketable securities 111,697 [1],[2] 93,464 [1],[2]
Available-for-Sale 18,352 [2] 43,915 [2]
Less: current portion of marketable securities (5,056) [2] (15,810) [2]
Non-current marketable securities 13,296 [2] 28,105 [2]
Total 134,559 141,916
Less: current portion of marketable securities (9,566) (20,347)
Non-current marketable securities 124,993 121,569
Mutual Funds
    
Schedule Of Marketable Securities [Line Items]    
Trading 116,207 [1],[2] 98,001 [1],[2]
Total 116,207 98,001
Corporate Bonds
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 18,352 [2] 42,111 [2]
Total 18,352 42,111
U.S. Treasury And Agency Securities
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale   1,804 [2]
Total   $ 1,804
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $117.6 million and $99.2 million as of April 30, 2014 and 2013, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During fiscal 2014, 2013 and 2012, the fair value of the investments increased; therefore, the Company recognized income of $9.5 million, $7.6 million and $1.0 million, respectively, which are recorded in other income (loss).
[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, 2014 and 2013, the Company had no investments classified as Level 3.