Subsidiary Guarantors (Schedule Of Condensed Consolidating Balance Sheet) (Parenthetical) (Detail) (USD $)
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Jul. 31, 2012
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Apr. 30, 2012
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Jul. 31, 2011
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Class A Common Stock [Member]
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Condensed Financial Statements, Captions [Line Items] | |||
Common Stock, Authorized shares | 100,000,000 | 100,000,000 | |
Common stock, par value | $ 0.01 | $ 0.01 | |
Common stock, issued shares | 26,367,000 | 25,991,000 | |
Common Stock, outstanding shares | 26,367,000 | 25,991,000 | 25,898,000 |
Class B Common Stock [Member]
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Condensed Financial Statements, Captions [Line Items] | |||
Common Stock, Authorized shares | 1,000,000 | 1,000,000 | |
Common stock, par value | $ 0.01 | $ 0.01 | |
Common stock, votes (in votes per share) | $ 10 | $ 10 | |
Common stock, issued shares | 988,000 | 988,000 | |
Common Stock, outstanding shares | 988,000 | 988,000 | 988,000 |