Long -Term Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 26, 2012	Feb. 27, 2011	Feb. 26, 2012	Feb. 27, 2011
Net interest expense
Long-term debt	$ 51.7	$ 56.5	$ 160.5	$ 173.1
Short-term debt	0.2		0.3	0.2
Interest income	(1.0)	(2.5)	(3.2)	(41.3)
Interest capitalized	(1.2)	(2.4)	(4.4)	(9.4)
Interest expense, net	$ 49.7	$ 51.6	$ 153.2	$ 122.6