Summary of Significant Accounting Policies (Details 8) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	May. 29, 2015	May. 31, 2015	May. 31, 2014	May. 31, 2013
Shares repurchased (in shares)	4,185,960
Share repurchase price (in dollars per share)	$ 31.90
Cash tender offer amount	$ 133.5
Fees and expenses	$ 1.2
Shares repurchased		$ 16.8
Change in treasury stock due to restricted stock awards and exercise of stock options, net of shares withheld to satisfy statutory tax obligations		3.6
Repurchase of treasury shares		151.5	$ 1.0	$ 14.6
Treasury Stock
Total increase (decrease) in treasury stock			(1.8)	9.7
Change in treasury stock due to restricted stock awards and exercise of stock options, net of shares withheld to satisfy statutory tax obligations			2.8	4.9
Repurchase of treasury shares		$ 151.5	$ 1.0	$ 14.6