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Income Taxes - Schedule of Provisions (Benefit) for Income Taxes Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Federal      
Current   $ 121  
Deferred (2,827) 1,468 (8,653)
Deferred benefit of loss carryforwards     (15,748)
Total (2,827) 1,589 (24,401)
State      
Current 1,040 (352) (599)
Current benefit of loss carryforwards (22)    
Deferred (717) 372 2,353
Deferred benefit of loss carryforwards   (16) (1,076)
Total 301 4 678
Income before provision (benefit) for income tax, net $ (2,526) $ 1,593 $ (23,723)