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Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Apr. 30, 2013
Schedule Of Marketable Securities [Line Items]    
Trading $ 111,651 [1],[2] $ 98,001 [1],[2]
Less: current portion of marketable securities (3,649) [1],[2] (4,537) [1],[2]
Non-current marketable securities 108,002 [1],[2] 93,464 [1],[2]
Available-for-Sale 18,322 [2],[3] 43,915 [2],[3]
Less: current portion of marketable securities (6,071) [2],[3] (15,810) [2],[3]
Non-current marketable securities 12,251 [2],[3] 28,105 [2],[3]
Total 129,973 141,916
Less: current portion of marketable securities (9,720) (20,347)
Non-current marketable securities 120,253 121,569
Mutual Funds
    
Schedule Of Marketable Securities [Line Items]    
Trading 111,651 [1],[2] 98,001 [1],[2]
Total 111,651 98,001
Corporate Bonds
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 18,322 [2],[3] 42,111 [2],[3]
Total 18,322 42,111
U.S. Treasury And Agency Securities
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale   1,804 [2],[3]
Total   $ 1,804
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $115.4 million and $99.2 million as of July 31, 2013 and April 30, 2013, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans).
[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, 2013 and April 30, 2013, the Company had cash equivalents of $45.8 million and $93.6 million, respectively, classified as Level 1. As of April 30, 2013, the Company had restricted cash of $2.9 million, classified as Level 1. As of July 31, 2013, the Company had no restricted cash balance. As of July 31, 2013 and April 30, 2013, the Company had no investments classified as Level 3.
[3] These securities represent excess cash available for general corporate purposes invested, under our investment policy, with a professional money manager.