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Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2013
Apr. 30, 2013
Schedule Of Marketable Securities [Line Items]    
Trading $ 117,963 [1],[2] $ 98,001 [1],[2]
Less: current portion of marketable securities (4,481) [1],[2] (4,537) [1],[2]
Non-current marketable securities 113,482 [1],[2] 93,464 [1],[2]
Available-for-Sale 14,322 [2],[3] 43,915 [2],[3]
Less: current portion of marketable securities (2,050) [2],[3] (15,810) [2],[3]
Non-current marketable securities 12,272 [2],[3] 28,105 [2],[3]
Total 132,285 141,916
Less: current portion of marketable securities (6,531) (20,347)
Non-current marketable securities 125,754 121,569
Mutual Funds
    
Schedule Of Marketable Securities [Line Items]    
Trading 117,963 [1],[2] 98,001 [1],[2]
Total 117,963 98,001
Corporate Bonds
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 14,322 [2],[3] 42,111 [2],[3]
Total 14,322 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 $119.3 million and $99.2 million as of October 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 October 31, 2013 and April 30, 2013, the Company had cash equivalents of $89.2 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 October 31, 2013, the Company had no restricted cash balance. As of October 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.