Restructuring (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Feb. 26, 2012
Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	$ 18.5
2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	67.5
Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	74.7
Selling, general and administrative expenses [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	18.5
Selling, general and administrative expenses [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	47.7
Selling, general and administrative expenses [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	45.2
Other, net [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	8.3
Other, net [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	13.4
Other, net [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	10.8
Severance and related costs [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	8.8
Severance and related costs [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	16.8
Severance and related costs [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	7.7
Asset impairment charge [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	17.5
Asset impairment charge [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	26.7
Cost of goods sold [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	19.8
Cost of goods sold [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	29.5
Accelerated depreciation [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	1.4
Accelerated depreciation [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	19.1
Accelerated depreciation [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	19.6
Inventory write-offs and related costs [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	0.7
Inventory write-offs and related costs [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	9.9
Corporate [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	3.8
Corporate [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	3.6
Corporate [Member] | Selling, general and administrative expenses [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	3.8
Corporate [Member] | Selling, general and administrative expenses [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	3.6
Corporate [Member] | Other, net [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	0.1
Corporate [Member] | Other, net [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	3.6
Corporate [Member] | Severance and related costs [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	2.3
Corporate [Member] | Accelerated depreciation [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	1.4
Consumer foods [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	13.4
Consumer foods [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	63.9
Consumer foods [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	58.7
Consumer foods [Member] | Selling, general and administrative expenses [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	13.4
Consumer foods [Member] | Selling, general and administrative expenses [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	44.1
Consumer foods [Member] | Selling, general and administrative expenses [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	29.6
Consumer foods [Member] | Other, net [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	6.9
Consumer foods [Member] | Other, net [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	9.8
Consumer foods [Member] | Other, net [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	9.3
Consumer foods [Member] | Severance and related costs [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	6.5
Consumer foods [Member] | Severance and related costs [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	16.8
Consumer foods [Member] | Severance and related costs [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	7.6
Consumer foods [Member] | Asset impairment charge [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	17.5
Consumer foods [Member] | Asset impairment charge [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	12.7
Consumer foods [Member] | Cost of goods sold [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	19.8
Consumer foods [Member] | Cost of goods sold [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	29.1
Consumer foods [Member] | Accelerated depreciation [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	19.1
Consumer foods [Member] | Accelerated depreciation [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	19.6
Consumer foods [Member] | Inventory write-offs and related costs [Member] | 2010 plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	0.7
Consumer foods [Member] | Inventory write-offs and related costs [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	9.5
Commercial foods [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	1.3
Commercial foods [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	16.0
Commercial foods [Member] | Selling, general and administrative expenses [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	1.3
Commercial foods [Member] | Selling, general and administrative expenses [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	15.6
Commercial foods [Member] | Other, net [Member] | Administrative efficiency restructuring plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	1.3
Commercial foods [Member] | Other, net [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	1.5
Commercial foods [Member] | Severance and related costs [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	0.1
Commercial foods [Member] | Asset impairment charge [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	14.0
Commercial foods [Member] | Cost of goods sold [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	0.4
Commercial foods [Member] | Inventory write-offs and related costs [Member] | Network optimization plan [Member]
Summary of expected realization of restructuring pre tax expenses
Restructuring and related cost, expected cost	$ 0.4