Quarterly report pursuant to Section 13 or 15(d)

Summary of Marketable Securities (Detail)

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Summary of Marketable Securities (Detail) - USD ($)
$ in Thousands
Jul. 31, 2015
Apr. 30, 2015
Schedule Of Marketable Securities [Line Items]    
Trading [1],[2] $ 127,793 $ 131,399
Less: current portion of marketable securities [1],[2] (9,714) (12,580)
Non-current marketable securities [1],[2] 118,079 118,819
Available-for-Sale [1] 10,145 13,177
Less: current portion of marketable securities [1] (10,145) (13,177)
Non-current marketable securities [1] 0 0
Total 137,938 144,576
Less: current portion of marketable securities (19,859) (25,757)
Non-current marketable securities 118,079 118,819
Mutual Funds    
Schedule Of Marketable Securities [Line Items]    
Trading [1],[2] 127,793 131,399
Total 127,793 131,399
Corporate Bonds    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale [1] 10,145 13,177
Total $ 10,145 $ 13,177
[1] 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, 2015 and April 30, 2015, the Company had no investments classified as Level 3.
[2] These investments are held in trust for settlement of the Company's vested and unvested obligations of $125.5 million and $129.1 million as of July 31, 2015 and April 30, 2015, respectively, under the ECAP (see Note 6 -Deferred Compensation and Retirement Plans). During the three months ended July 31, 2015 and 2014, the fair value of the investments increased; therefore, the Company recognized income of $0.7 million and $2.0 million, respectively, which was recorded in other (loss) income, net.