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Earnings Per Share - Schedule of Numerator and Denominator Used In Computation of Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2013
Class A Common Stock [Member]
Apr. 30, 2012
Class A Common Stock [Member]
Apr. 30, 2011
Class A Common Stock [Member]
Apr. 30, 2010
Class A Common Stock [Member]
Apr. 30, 2013
Class B Common Stock [Member]
Apr. 30, 2012
Class B Common Stock [Member]
Apr. 30, 2011
Class B Common Stock [Member]
Apr. 30, 2010
Class B Common Stock [Member]
Numerator:                      
Loss from continuing operations before discontinued operations attributable to common stockholders $ (49,662) $ (77,697) $ (2,964)                
Number of shares outstanding, end of period                      
Common stock, shares outstanding       38,662,000 25,991,000 25,589,000 24,944,000 988,000 988,000 988,000 988,000
Unvested restricted stock (134,000) (127,000) (141,000)                
Effect of weighted average shares outstanding during period (5,501,000) (103,000) (331,000)                
Weighted average number of common shares used in basic and diluted EPS 34,015,000 26,749,000 26,105,000