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Summary of Marketable Securities (Detail) - USD ($) $ in Thousands | Jul. 31, 2015 | Apr. 30, 2015
--- | --- | ---
Schedule Of Marketable Securities [Line Items] |  |  |
Trading | [1],[2] | $ 127,793 | $ 131,399
Less: current portion of marketable securities | [1],[2] | (9,714) | (12,580)
Non-current marketable securities | [1],[2] | 118,079 | 118,819
Available-for-Sale | [1] | 10,145 | 13,177
Less: current portion of marketable securities | [1] | (10,145) | (13,177)
Non-current marketable securities | [1] | 0 | 0
Total |  | 137,938 | 144,576
Less: current portion of marketable securities |  | (19,859) | (25,757)
Non-current marketable securities |  | 118,079 | 118,819
Mutual Funds |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |
Trading | [1],[2] | 127,793 | 131,399
Total |  | 127,793 | 131,399
Corporate Bonds |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |
Available-for-Sale | [1] | 10,145 | 13,177
Total |  | $ 10,145 | $ 13,177
[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 July 31, 2015 and April 30, 2015, the Company had no investments classified as Level 3.
[2] | These investments are held in trust for settlement of the Company's vested and unvested obligations of $125.5 million and $129.1 million as of July 31, 2015 and April 30, 2015, respectively, under the ECAP (see Note 6 -Deferred Compensation and Retirement Plans). During the three months ended July 31, 2015 and 2014, the fair value of the investments increased; therefore, the Company recognized income of $0.7 million and $2.0 million, respectively, which was recorded in other (loss) income, net.

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