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Marketable Securities - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2014 | Jul. 31, 2013 | Apr. 30, 2014
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Proceeds from sales/maturities of available-for-sale securities | $ 2,000,000 |  | $ 29,300,000 |  |
Trading securities | 116,719,000 | [1],[2] |  | 116,207,000 | [1],[2]
Gross unrealized gains | 10,400,000 |  |  | 9,200,000 |
Gross unrealized losses | $ 500,000 |  |  | $ 700,000 |
Minimum |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale marketable securities, remaining maturities | 5 months |  |  |  |
Maximum |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale marketable securities, remaining maturities | 1 year 6 months |  |  |  |
[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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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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