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Earnings Per Share (Schedule of Numerator and Denominator Used In Computation of Basic and Diluted Earnings Per Share) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
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Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 Class A Common Stock [Member] | Apr. 30, 2012 Class A Common Stock [Member] | Jan. 31, 2012 Class A Common Stock [Member] | Jan. 31, 2013 Class B Common Stock [Member] | Apr. 30, 2012 Class B Common Stock [Member] | Jan. 31, 2012 Class B Common Stock [Member]
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |
Loss from continuing operations before discontinued operations attributable to common stockholders | $ (11,407) | $ (24,635) | $ (40,747) | $ (29,186) |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 38,658,000 | 25,991,000 | 25,987,000 | 988,000 | 988,000 | 988,000
Unvested restricted stock | (134,000) | (127,000) | (134,000) | (127,000) |  |  |  |  |  |
Effect of weighted average shares outstanding during period | (282,000) | (26,000) | (7,147,000) | (133,000) |  |  |  |  |  |
Weighted average number of common shares used in basic and diluted EPS | 39,230,000 | 26,822,000 | 32,365,000 | 26,715,000 |  |  |  |  |  |

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