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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Earnings [Member]
Balance at Apr. 25, 2014 $ 259,099,844 $ 318,197 $ 426,866,998 $ (188,519,469) $ 454,850 $ 19,979,268
Balance (shares) at Apr. 25, 2014   31,819,678        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation plans 10,271,193 $ 2,009 10,269,184      
Stock-based compensation plans (shares)   200,891        
Purchase of treasury stock (29,068,101)     (29,068,101)    
Net income (loss) 30,792,012         30,792,012
Foreign currency translation income (loss) (1,201,616)       (1,201,616)  
Balance at Oct. 24, 2014 269,893,332 $ 320,206 437,136,182 (217,587,570) (746,766) 50,771,280
Balance (shares) at Oct. 24, 2014   32,020,569        
Balance at Apr. 24, 2015 $ 276,573,731 $ 320,542 445,362,045 (243,534,888) (3,400,770) 77,826,802
Balance (shares) at Apr. 24, 2015 32,054,236 32,054,236        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation plans $ 25,914,578 $ 864 25,913,714      
Stock-based compensation plans (shares)   86,378        
Reclass of stock-based compensation to current liability - related to cashed-out options (4,813,503)   (4,813,503)      
Purchase of treasury stock (7,349,818)     (7,349,818)    
Net income (loss) (12,672,180)         (12,672,180)
Foreign currency translation income (loss) 733,141       733,141  
Balance at Oct. 18, 2015 $ 278,385,949 $ 321,406 $ 466,462,256 $ (250,884,706) $ (2,667,629) $ 65,154,622
Balance (shares) at Oct. 18, 2015 32,140,614 32,140,614