Workforce Reduction Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 24, 2014
Restructuring Cost and Reserve [Line Items]
Payments	$ (8.7)
Adjustments	(0.8)
Balance at August 24, 2014	5.0
September 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	8.5
January 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.8
May 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5.2
Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Payments	(8.0)	[1]
Adjustments	(0.6)	[1]
Balance at August 24, 2014	4.8	[1]
Employee termination benefits | September 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	7.7	[1]
Employee termination benefits | January 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.7	[1]
Employee termination benefits | May 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5.0	[1]
Other
Restructuring Cost and Reserve [Line Items]
Payments	(0.7)
Adjustments	(0.2)
Balance at August 24, 2014	0.2
Other | September 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.8
Other | January 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.1
Other | May 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0.2

[1] Excludes costs associated with stock options and restricted stock that will be settled in shares upon vesting.