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Summary of Marketable Securities (Detail) - USD ($) $ in Thousands | Jan. 31, 2016 | Apr. 30, 2015
--- | --- | ---
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading |  | $ 135,938 | $ 131,399 | [1],[2]
Less: current portion of marketable securities | [1],[2] | (9,118) | (12,580) |
Non-current marketable securities | [1],[2] | 126,820 | 118,819 |
Available-for-Sale |  | 0 | 13,177 | [1]
Less: current portion of marketable securities | [1] |  | (13,177) |
Non-current marketable securities | [1] | 0 | 0 |
Total |  |  | 144,576 |
Less: current portion of marketable securities |  | (9,118) | (25,757) |
Non-current marketable securities |  | 126,820 | 118,819 |
Mutual Funds |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading | [1],[2] | 135,938 | 131,399 |
Total |  | $ 135,938 | 131,399 |
Corporate Bonds |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available-for-Sale | [1] |  | 13,177 |
Total |  |  | $ 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 January 31, 2016 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 $133.0 million and $129.1 million as of January 31, 2016 and April 30, 2015, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During the three and nine months ended January 31, 2016, the fair value of the investments decreased; therefore, the Company recognized a loss of $7.1 million and $8.9 million, respectively, which was recorded in other (loss) income, net. During the three months ended January 31, 2015, the fair value of investments decreased; therefore, the Company recognized a loss of $0.2 million, which was recorded in other (loss) income, net. For the nine months ended January 31, 2015, the fair value of the investments increased; therefore, the Company recognized income of $4.3 million, which was recorded in other (loss) income, net.

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