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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.

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