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Marketable Securities - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended
Oct. 31, 2013
Apr. 30, 2013
Schedule Of Marketable Securities [Line Items]    
Trading securities $ 117,963,000 [1],[2] $ 98,001,000 [1],[2]
Gross unrealized gains 9,200,000 3,100,000
Gross unrealized losses $ 600,000 $ 0
Minimum
    
Schedule Of Marketable Securities [Line Items]    
Available for sale marketable securities, remaining maturities 7 months  
Maximum
    
Schedule Of Marketable Securities [Line Items]    
Available for sale marketable securities, remaining maturities 2 years  
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $119.3 million and $99.2 million as of October 31, 2013 and April 30, 2013, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans).
[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, 2013 and April 30, 2013, the Company had cash equivalents of $89.2 million and $93.6 million, respectively, classified as Level 1. As of April 30, 2013, the Company had restricted cash of $2.9 million, classified as Level 1. As of October 31, 2013, the Company had no restricted cash balance. As of October 31, 2013 and April 30, 2013, the Company had no investments classified as Level 3.