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Income Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Oct. 18, 2015
Oct. 24, 2014
Oct. 18, 2015
Oct. 24, 2014
Earnings Per Share [Abstract]        
Net income (loss) $ (25,091,348) $ 17,273,190 $ (12,672,180) $ 30,792,012
Basic weighted average shares outstanding (in Shares) 26,024,857 26,574,687 26,009,844 26,636,238
Add effects of stock options (in shares) 0 217,184 0 229,276
Diluted weighted average shares outstanding (in Shares) 26,024,857 26,791,871 26,009,844 26,865,514
Basic income (loss) per share (in Dollars per Share) $ (0.96) $ 0.65 $ (0.49) $ 1.16
Diluted income (loss) per share (in Dollars per Share) $ (0.96) $ 0.64 $ (0.49) $ 1.15