Workforce Reduction Costs - Selling, General and Administrative Expenses (Details) (Selling, General and Administrative, USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Feb. 22, 2015		Feb. 23, 2014		Feb. 22, 2015		Feb. 23, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0.7		$ 0.2		$ 28.1		$ 11.9
Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.7	[1]	0.3	[1]	27.7	[1]	11.2	[1]
Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	[2]	$ (0.1)	[2]	$ 0.4	[2]	$ 0.7	[2]

[1] Includes salary and stock-based compensation expense.

[2] Includes postemployment medical, outplacement and relocation costs.