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Marketable Securities - Additional Information (Detail) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2013 | Apr. 30, 2013
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading securities | $ 117,963,000 | [1],[2] | $ 98,001,000 | [1],[2]
Gross unrealized gains | 9,200,000 |  | 3,100,000 |
Gross unrealized losses | $ 600,000 |  | $ 0 |
Minimum |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available for sale marketable securities, remaining maturities | 7 months |  |  |
Maximum |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available for sale marketable securities, remaining maturities | 2 years |  |  |
[1] | These investments are held in trust for settlement of the Company's vested and unvested obligations of $119.3 million and $99.2 million as of October 31, 2013 and April 30, 2013, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans).
[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 October 31, 2013 and April 30, 2013, the Company had cash equivalents of $89.2 million and $93.6 million, respectively, classified as Level 1. As of April 30, 2013, the Company had restricted cash of $2.9 million, classified as Level 1. As of October 31, 2013, the Company had no restricted cash balance. As of October 31, 2013 and April 30, 2013, the Company had no investments classified as Level 3.

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: 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=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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