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Summary of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Oct. 31, 2012 | Apr. 30, 2012
--- | --- | ---
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading | $ 93,852 | [1],[2] | $ 82,176 | [1],[2]
Less: current portion of marketable securities | (4,474) | [1],[2] | (7,613) | [1],[2]
Non-current marketable securities | 89,378 | [1],[2] | 74,563 | [1],[2]
Available-for-Sale | 45,082 | [2],[3] | 53,558 | [2],[3]
Less: current portion of marketable securities | (25,768) | [2],[3] | (33,323) | [2],[3]
Non-current marketable securities, Available-for-Sale | 19,314 | [2],[3] | 20,235 | [2],[3]
Total | 138,934 |  | 135,734 |
Less: current portion of marketable securities | (30,242) |  | (40,936) |
Non-current marketable securities | 108,692 |  | 94,798 |
Mutual Funds |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading | 93,852 | [1],[2] | 82,176 | [1],[2]
Total | 93,852 |  | 82,176 |
Corporate Bonds |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available-for-Sale | 41,079 | [2],[3] | 44,563 | [2],[3]
Total | 41,079 |  | 44,563 |
Commercial Paper |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available-for-Sale | 1,999 | [2],[3] | 5,989 | [2],[3]
Total | 1,999 |  | 5,989 |
U.S. Treasury And Agency Securities |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available-for-Sale | 2,004 | [2],[3] | 3,006 | [2],[3]
Total | $ 2,004 |  | $ 3,006 |
[1] | These investments are held in trust for settlement of the Company's obligations of $93.9 million and $82.6 million as of October 31, 2012 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 $1.1 million and decreased by $4.1 million during the six months ended October 31, 2012 and 2011, 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 $19.3 million and $1.7 million, respectively, offset by distributions of $10.4 million for the six months ended October 31, 2012.
[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, 2012 and April 30, 2012, the Company had cash equivalents of $74.1 million and $60.5 million, respectively, and restricted cash in both periods of $10.1 million classified as Level 1.
[3] | These securities represent excess cash invested, under our investment policy, with a professional money manager.

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