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Share-Based Compensation Plans Performance Share Awards Valuation Assumptions (Details) - Performance Shares
12 Months Ended
Apr. 28, 2017
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant date market price (in dollars per share) $ 39.69
Granted (in dollars per share) $ 34.08
Price volatility (as a percent) 30.90%
Risk-free interest rate (as a percent) 0.92%
Average volatility of peer companies (as a percent) 0.362
Average correlation coefficient of peer companies 0.774