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Amortized Cost and Fair Values of Marketable Securities Classified as Available-For-Sale Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Apr. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   $ 43,835
Gross Unrealized Gains   94
Gross Unrealized Losses   (14) [1]
Estimated Fair Value 18,322 [2],[3] 43,915 [2],[3]
Corporate Bonds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 18,337 42,033
Gross Unrealized Gains 13 92
Gross Unrealized Losses (28) [1] (14) [1]
Estimated Fair Value 18,322 [2],[3] 42,111 [2],[3]
U.S. Treasury And Agency Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   1,802
Gross Unrealized Gains   2
Estimated Fair Value   $ 1,804 [2],[3]
[1] There are no marketable securities that have been in a continuous unrealized loss position for 12 months or more.
[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 July 31, 2013 and April 30, 2013, the Company had cash equivalents of $45.8 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 July 31, 2013, the Company had no restricted cash balance. As of July 31, 2013 and April 30, 2013, the Company had no investments classified as Level 3.
[3] These securities represent excess cash available for general corporate purposes invested, under our investment policy, with a professional money manager.