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Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
Apr. 30, 2014
Schedule Of Marketable Securities [Line Items]    
Trading $ 135,603 [1],[2] $ 116,207 [1],[2]
Less: current portion of marketable securities (11,747) [1],[2] (4,510) [1],[2]
Non-current marketable securities 123,856 [1],[2] 111,697 [1],[2]
Available-for-Sale 16,262 [1] 18,352 [1]
Less: current portion of marketable securities (14,226) [1] (5,056) [1]
Non-current marketable securities 2,036 [1] 13,296 [1]
Total 151,865 134,559
Less: current portion of marketable securities (25,973) (9,566)
Non-current marketable securities 125,892 124,993
Mutual Funds
    
Schedule Of Marketable Securities [Line Items]    
Trading 135,603 [1],[2] 116,207 [1],[2]
Total 135,603 116,207
Corporate Bonds
    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale 16,262 [1] 18,352 [1]
Total $ 16,262 $ 18,352
[1] 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, 2014 and April 30, 2014, the Company had no investments classified as Level 3.
[2] (1) These investments are held in trust for settlement of the Company's vested and unvested obligations of $135.9 million and $117.6 million as of October 31, 2014 and April 30, 2014, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During the three and six months ended October 31, 2014, the fair value of the investments increased; therefore, the Company recognized income of $2.5 million and $4.5 million, respectively, which was recorded in other income, net. During the three and six months ended October 31, 2013, the fair value of the investments increased; therefore, the Company recognized income of $4.4 million and $6.4 million, respectively, which was recorded in other income, net.