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Amortized Cost and Fair Values of Marketable Securities Classified as Available-For-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jul. 31, 2013 | Apr. 30, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  |  | $ 43,835 |
Gross Unrealized Gains |  |  | 94 |
Gross Unrealized Losses |  |  | (14) | [1]
Estimated Fair Value | 18,322 | [2],[3] | 43,915 | [2],[3]
Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 18,337 |  | 42,033 |
Gross Unrealized Gains | 13 |  | 92 |
Gross Unrealized Losses | (28) | [1] | (14) | [1]
Estimated Fair Value | 18,322 | [2],[3] | 42,111 | [2],[3]
U.S. Treasury And Agency Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  |  | 1,802 |
Gross Unrealized Gains |  |  | 2 |
Estimated Fair Value |  |  | $ 1,804 | [2],[3]
[1] | There are no marketable securities that have been in a continuous unrealized loss position for 12 months or more.
[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, 2013 and April 30, 2013, the Company had cash equivalents of $45.8 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 July 31, 2013, the Company had no restricted cash balance. As of July 31, 2013 and April 30, 2013, the Company had no investments classified as Level 3.
[3] | These securities represent excess cash available for general corporate purposes invested, under our investment policy, with a professional money manager.

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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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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