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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Jan. 18, 2011
Income Taxes [Line Items]      
Income tax settlement amount   $ 800  
Tax paid for income tax settlement   430  
Interest paid for income tax settlement   370  
Aggregate finance asserting liability total     3,852
Taxation payable     2,220
Penalties and interest payable     1,632
Potential cumulative liability   8.00%  
Net operating loss carryforwards 73,772    
Net operating loss carryforwards expiry period 2024 through 2034    
State net operating loss carryforwards expiry period 93,680    
Net operating loss carryforwards benefit recorded additional paid-in capital 383    
Alternative minimum tax credit carryforwards 3,330 3,330  
General business tax credit carryforwards 2,666 2,095  
General business tax credit carryforwards expiration date 2023 through 2034    
Capital loss carryforward 2,510    
Capital loss carryforward expiration period 2019    
Valuation allowance 14,188    
Settlements   (430)  
Unrecognized tax benefit net of federal benefit on state issue 0 0  
Unrecognized tax benefits 0    
Uncertain tax positions, accrued interest 116 76  
Uncertain tax positions, penalties 8 9  
Accrued income tax expense 40 41  
Business Acquisition [Member]
      
Income Taxes [Line Items]      
Increase (decrease) in valuation allowance 5,084 (5,084)  
State [Member]
      
Income Taxes [Line Items]      
Net operating loss carryforwards expiry period 2015 through 2034    
2019 Year [Member]
      
Income Taxes [Line Items]      
Capital loss carryforward $ 6,235