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Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2014
Apr. 30, 2014
Schedule Of Marketable Securities [Line Items]    
Trading $ 116,719 [1],[2] $ 116,207 [1],[2]
Less: current portion of marketable securities (11,581) [1],[2] (4,510) [1],[2]
Non-current marketable securities 105,138 [1],[2] 111,697 [1],[2]
Available-for-Sale 16,296 [2] 18,352 [2]
Less: current portion of marketable securities (6,052) [2] (5,056) [2]
Non-current marketable securities 10,244 [2] 13,296 [2]
Total 133,015 134,559
Less: current portion of marketable securities (17,633) (9,566)
Non-current marketable securities 115,382 124,993
Mutual Funds
    
Schedule Of Marketable Securities [Line Items]    
Trading 116,719 [1],[2] 116,207 [1],[2]
Total 116,719 116,207
Corporate Bonds
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 16,296 [2] 18,352 [2]
Total $ 16,296 $ 18,352
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $118.2 million and $117.6 million as of July 31, 2014 and April 30, 2014, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During both the three months ended July 31, 2014 and 2013, the fair value of the investments increased; therefore, the Company recognized income of $2.0 million, which was recorded in other income, net.
[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, 2014 and April 30, 2014, the Company had no investments classified as Level 3.