XML 79 R54.htm IDEA: XBRL DOCUMENT v3.5.0.1
Share-Based Compensation Plans Performance Share Awards Valuation Assumptions (Details) - Performance Shares
12 Months Ended
Apr. 29, 2016
$ / shares
Apr. 24, 2015
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date market price (in dollars per share) $ 48.95  
Fair value (in dollars per share) $ 54.76 $ 0.00
Price volatility (as a percent) 29.40%  
Risk-free interest rate (as a percent) 1.03%  
Average volatility of peer companies (as a percent) 0.326  
Average correlation coefficient of peer companies 0.846