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Summary of Marketable Securities (Detail) - USD ($)
$ in Thousands
Jan. 31, 2016
Apr. 30, 2015
Schedule Of Marketable Securities [Line Items]    
Trading $ 135,938 $ 131,399 [1],[2]
Less: current portion of marketable securities [1],[2] (9,118) (12,580)
Non-current marketable securities [1],[2] 126,820 118,819
Available-for-Sale 0 13,177 [1]
Less: current portion of marketable securities [1]   (13,177)
Non-current marketable securities [1] 0 0
Total   144,576
Less: current portion of marketable securities (9,118) (25,757)
Non-current marketable securities 126,820 118,819
Mutual Funds    
Schedule Of Marketable Securities [Line Items]    
Trading [1],[2] 135,938 131,399
Total $ 135,938 131,399
Corporate Bonds    
Schedule Of Marketable Securities [Line Items]    
Available-for-Sale [1]   13,177
Total   $ 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 January 31, 2016 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 $133.0 million and $129.1 million as of January 31, 2016 and April 30, 2015, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During the three and nine months ended January 31, 2016, the fair value of the investments decreased; therefore, the Company recognized a loss of $7.1 million and $8.9 million, respectively, which was recorded in other (loss) income, net. During the three months ended January 31, 2015, the fair value of investments decreased; therefore, the Company recognized a loss of $0.2 million, which was recorded in other (loss) income, net. For the nine months ended January 31, 2015, the fair value of the investments increased; therefore, the Company recognized income of $4.3 million, which was recorded in other (loss) income, net.