Garner, North Carolina Accident (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 29, 2011	May 30, 2010
Cost of goods sold:
Inventory write-downs and other costs	$ 0.9	$ 11.9
Selling, general and administrative expenses:
Fixed asset impairments, clean-up costs, etc.	3.2	50.1
Insurance recoveries recognized	(109.4)	(58.1)
Total selling, general and administrative expenses	(106.2)	(8.0)
Net loss (gain)	(105.3)	3.9
Consumer foods [Member]
Cost of goods sold:
Inventory write-downs and other costs	0.9	11.9
Selling, general and administrative expenses:
Fixed asset impairments, clean-up costs, etc.	2.6	47.5
Insurance recoveries recognized	(109.4)	(58.1)
Total selling, general and administrative expenses	(106.8)	(10.6)
Net loss (gain)	(105.9)	1.3
Corporate [Member]
Selling, general and administrative expenses:
Fixed asset impairments, clean-up costs, etc.	0.6	2.6
Total selling, general and administrative expenses	0.6	2.6
Net loss (gain)	$ 0.6	$ 2.6