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Marketable Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Apr. 30, 2015
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |
Marketable securities classified as available-for-sale investments | $ 0 |  | $ 0 |  | $ 13,177 | [1]
Proceeds from maturities of available-for-sale securities | 2,000 | $ 1,000 | 13,100 | $ 3,000 |  |
Trading securities | 135,938 |  | 135,938 |  | 131,399 | [1],[2]
Gross unrealized gains | 100 |  | 100 |  | 8,300 |
Gross unrealized losses | $ 6,500 |  | $ 6,500 |  | $ 200 |
[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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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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