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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Schedule Of Marketable Securities [Line Items]    
Marketable securities classified as available-for-sale investments $ 0 $ 13,177 [1]
Proceeds from maturities of available-for-sale securities 13,100 5,000
Trading securities 141,430 131,399 [1],[2]
Gross unrealized gains 1,400 8,300
Gross unrealized losses $ 2,600 $ 200
[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 April 30, 2016 and 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 $138.8 million and $129.1 million as of April 30, 2016 and 2015, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During fiscal 2016, the fair value of investments decreased; therefore, the Company recognized a loss of $3.3 million, which was recorded in other income (loss), net. During fiscal 2015 and 2014, the fair value of the investments increased; therefore, the Company recognized income of $8.8 million and $9.5 million, respectively, which was recorded in other income (loss), net.