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Summary of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2014 | Apr. 30, 2013
--- | --- | ---
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading | $ 115,123 | [1],[2] | $ 98,001 | [1],[2]
Less: current portion of marketable securities | (4,310) | [1],[2] | (4,537) | [1],[2]
Non-current marketable securities | 110,813 | [1],[2] | 93,464 | [1],[2]
Available-for-Sale | 14,297 | [2] | 43,915 | [2]
Less: current portion of marketable securities | (2,027) | [2] | (15,810) | [2]
Non-current marketable securities | 12,270 | [2] | 28,105 | [2]
Total | 129,420 |  | 141,916 |
Less: current portion of marketable securities | (6,337) |  | (20,347) |
Non-current marketable securities | 123,083 |  | 121,569 |
Mutual Funds |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading | 115,123 | [1],[2] | 98,001 | [1],[2]
Total | 115,123 |  | 98,001 |
Corporate Bonds |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available-for-Sale | 14,297 | [2] | 42,111 | [2]
Total | 14,297 |  | 42,111 |
U.S. Treasury And Agency Securities |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available-for-Sale |  |  | 1,804 | [2]
Total |  |  | $ 1,804 |
[1] | These investments are held in trust for settlement of the Company's vested and unvested obligations of $116.4 million and $99.2 million as of January 31, 2014 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 January 31, 2014 and April 30, 2013, the Company had cash equivalents of $129.2 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 January 31, 2014, the Company had no restricted cash balance. As of January 31, 2014 and April 30, 2013, the Company had no investments classified as Level 3.

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- Definition Amount of investment in debt and equity 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=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: 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 + Details
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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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