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Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2012
Apr. 30, 2011
Income Taxes [Abstract]    
Deferred compensation $ 62,710 $ 64,333
Loss and credit carryforwards 33,342 33,834
Allowance for doubtful accounts 1,388 1,797
Property and equipment   371
Deferred rent 6,887 6,422
Other 5,623 4,664
Gross deferred tax assets 109,950 111,421
Intangibles (11,103) (8,228)
Unrealized gain (1,059) (2,393)
Property and equipment (4,527)  
Other (52)  
Gross deferred tax liabilities (16,741) (10,621)
Valuation allowances (25,089) (26,168)
Net deferred tax asset $ 68,120 $ 74,632