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Marketable Securities - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2013 | Apr. 30, 2012
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading securities | $ 95,807,000 | [1],[2] | $ 82,176,000 | [1],[2]
Minimum |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available for sale marketable securities, remaining maturities | 1 month |  |  |
Maximum |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available for sale marketable securities, remaining maturities | 3 years |  |  |
Debt Securities |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Gross unrealized gains | 5,100,000 |  | 3,500,000 |
Gross unrealized losses |  |  | $ 400,000 |
[1] | (1) These investments are held in trust for settlement of the Company's obligations of $96.5 million and $82.6 million as of January 31, 2013 and April 30, 2012, respectively, under the Executive Capital Accumulation Plan ("ECAP") (see Note 6 - Deferred Compensation and Retirement Plans). The fair value of marketable securities classified as trading (held in trust to satisfy obligations under the ECAP) increased by $4.6 million and decreased by $2.3 million during the nine months ended January 31, 2013 and 2012, respectively, recorded in other income (loss), net on the consolidated statements of income. The remaining activity is comprised primarily of Company and employee contributions made of $20.0 million and $1.9 million, respectively, offset by distributions of $12.9 million for the nine months ended January 31, 2013.
[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, 2013 and April 30, 2012, the Company had cash equivalents of $58.5 million and $60.5 million and restricted cash of $2.9 million and $10.0 million, respectively, classified as Level 1.

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- Definition The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. + References Reference 1: 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 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 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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