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Shareholders' Equity (Deficit): Stock Options (Details) - shares
12 Months Ended
Apr. 26, 2017
Dec. 30, 2017
Apr. 25, 2017
Feb. 20, 2011
2001 Plan and 2010 Plan | Stock options | Minimum        
Stock Option Plans        
Exercise price of stock options as a percentage of fair value on the date of grant   100.00%    
Threshold voting rights above which the option exercise price may not be less than 110% of the fair market value (as a percent)   10.00%    
Exercise price of stock options as a percentage of fair value on the date of grant for an individual who owns more than 10% of voting rights   110.00%    
2001 Plan and 2010 Plan | Stock options | Maximum        
Stock Option Plans        
Term of the option   10 years    
2001 Plan        
Stock Option Plans        
Number of shares authorized for issuance       750,000
2010 Plan        
Stock Option Plans        
Increase in number of shares authorized for issuance 200,000      
Number of shares authorized for issuance 700,000   500,000  
Nonemployee Directors Plan | Stock options        
Stock Option Plans        
Number of shares authorized for issuance   350,000