Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 24, 2014	Aug. 25, 2013
Income Tax Contingency [Line Items]
Effective income tax rate	55.80%	15.30%
Income tax (benefit) expense	$ (24.4)	$ 7.6
(Loss) earnings before income taxes	(43.7)	49.8
Tax position, change is reasonably possible in the next twelve months	27.1
Loss on extinguishment of debt	80.0	0
Effective income tax rate, excluding debt extinguishment costs and debt extinguishment tax benefit (as a percent)	17.00%
Long-term Debt
Income Tax Contingency [Line Items]
Tax benefit related to loss on extinguishment of debt	30.6
Loss on extinguishment of debt	$ 80.0