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Marketable Securities - Additional Information (Detail) (USD $)
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Schedule Of Marketable Securities [Line Items]    
Proceeds from sales/maturities of available-for-sale securities $ 33,300,000 $ 38,100,000
Trading securities 116,207,000 [1],[2] 98,001,000 [1],[2]
Gross unrealized gains 9,200,000 3,100,000
Gross unrealized losses $ 700,000 $ 0
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 1 year 8 months 12 days  
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $117.6 million and $99.2 million as of April 30, 2014 and 2013, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During fiscal 2014, 2013 and 2012, the fair value of the investments increased; therefore, the Company recognized income of $9.5 million, $7.6 million and $1.0 million, respectively, which are recorded in other income (loss).
[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 April 30, 2014 and 2013, the Company had no investments classified as Level 3.