Stock-Based Compensation (Option Pricing Assumptions) (Details) - Stock Options - $ / shares		9 Months Ended
		Feb. 26, 2017	Feb. 28, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value (in dollars per share)	[1]	$ 9.08	$ 12.72
Dividend yield		3.50%	3.30%
Expected volatility of stock		24.30%	28.00%
Risk-free interest rate		1.40%	1.90%
Expected option life (in years)		6 years 6 months	6 years 6 months
Weighted-average exercise price per share (in dollars per share)	[1]	$ 59.70	$ 64.85

[1] Weighted averages for the three months ended February 28, 2016 were adjusted for the impact of the separation of Four Corners.