Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015	Feb. 28, 2016	Feb. 22, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate	21.70%	12.70%	20.10%	(60.50%)
Effective income tax rate, excluding debt extinguishment costs and debt extinguishment tax benefit (as a percent)	27.10%	19.20%	26.10%	19.50%
Tax position, change is reasonably possible in the next twelve months	$ 1.4		$ 1.4