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Marketable Securities - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Apr. 30, 2013
Schedule Of Marketable Securities [Line Items]      
Proceeds from sales/maturities of available-for-sale securities $ 33,300,000 $ 34,900,000  
Trading securities 115,123,000 [1],[2]   98,001,000 [1],[2]
Gross unrealized gains 8,000,000   3,100,000
Gross unrealized losses $ 900,000   $ 0
Minimum
      
Schedule Of Marketable Securities [Line Items]      
Available for sale marketable securities, remaining maturities 4 months    
Maximum
      
Schedule Of Marketable Securities [Line Items]      
Available for sale marketable securities, remaining maturities 1 year 9 months 18 days    
[1] These investments are held in trust for settlement of the Company's vested and unvested obligations of $116.4 million and $99.2 million as of January 31, 2014 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 January 31, 2014 and April 30, 2013, the Company had cash equivalents of $129.2 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 January 31, 2014, the Company had no restricted cash balance. As of January 31, 2014 and April 30, 2013, the Company had no investments classified as Level 3.