Summary of Expected Realization and Incurred Restructuring Pre Tax Expenses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	27 Months Ended
	Aug. 26, 2012	Aug. 26, 2012
Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 21.1
Restructuring and Related Cost, Incurred Cost	0.6	17.3
Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	82.0
Restructuring and Related Cost, Incurred Cost	3.8	76.2
Acquisition-related restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	9.9
Restructuring and Related Cost, Incurred Cost	1.8	6.3
Accelerated depreciation | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	1.5
Restructuring and Related Cost, Incurred Cost	0.1	1.2
Accelerated depreciation | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	22.6
Restructuring and Related Cost, Incurred Cost	1.6	22.1
Accelerated depreciation | Acquisition-related restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(0.2)
Severance and related costs | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	9.5
Restructuring and Related Cost, Incurred Cost	0.5	8.9
Severance and related costs | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	9.7
Restructuring and Related Cost, Incurred Cost		9.6
Severance and related costs | Acquisition-related restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	9.4
Restructuring and Related Cost, Incurred Cost	1.7	5.8
Selling, general and administrative expenses | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	21.1
Restructuring and Related Cost, Incurred Cost	0.6	17.3
Selling, general and administrative expenses | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	48.9
Restructuring and Related Cost, Incurred Cost	2.2	46.8
Selling, general and administrative expenses | Acquisition-related restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	9.9
Restructuring and Related Cost, Incurred Cost	2.0	6.3
Other, net | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	10.1
Restructuring and Related Cost, Incurred Cost		7.2
Other, net | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	12.2
Restructuring and Related Cost, Incurred Cost	2.5	10.2
Other, net | Acquisition-related restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	0.5
Restructuring and Related Cost, Incurred Cost	0.3	0.5
Inventory write-offs and related costs | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	10.5
Restructuring and Related Cost, Incurred Cost		7.3
Cost of goods sold | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	33.1
Restructuring and Related Cost, Incurred Cost	1.6	29.4
Cost of goods sold | Acquisition-related restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(0.2)
Asset impairment charge | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	27.0
Restructuring and Related Cost, Incurred Cost	(0.3)	27.0
Consumer Foods | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	14.1
Restructuring and Related Cost, Incurred Cost	0.2	12.4
Consumer Foods | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	65.2
Restructuring and Related Cost, Incurred Cost	3.0	59.4
Consumer Foods | Accelerated depreciation | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	22.6
Restructuring and Related Cost, Incurred Cost	1.6	22.1
Consumer Foods | Severance and related costs | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	6.8
Restructuring and Related Cost, Incurred Cost	0.2	6.4
Consumer Foods | Severance and related costs | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	9.6
Restructuring and Related Cost, Incurred Cost		9.5
Consumer Foods | Selling, general and administrative expenses | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	14.1
Restructuring and Related Cost, Incurred Cost	0.2	12.4
Consumer Foods | Selling, general and administrative expenses | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	32.5
Restructuring and Related Cost, Incurred Cost	1.4	30.4
Consumer Foods | Other, net | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	7.3
Restructuring and Related Cost, Incurred Cost		6.0
Consumer Foods | Other, net | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	9.9
Restructuring and Related Cost, Incurred Cost	1.7	7.9
Consumer Foods | Inventory write-offs and related costs | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	10.1
Restructuring and Related Cost, Incurred Cost		6.9
Consumer Foods | Cost of goods sold | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	32.7
Restructuring and Related Cost, Incurred Cost	1.6	29.0
Consumer Foods | Asset impairment charge | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	13.0
Restructuring and Related Cost, Incurred Cost	(0.3)	13.0
Corporate | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	5.9
Restructuring and Related Cost, Incurred Cost	0.4	3.9
Corporate | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	0.8
Restructuring and Related Cost, Incurred Cost	0.8	0.8
Corporate | Accelerated depreciation | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	1.5
Restructuring and Related Cost, Incurred Cost	0.1	1.2
Corporate | Severance and related costs | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	2.7
Restructuring and Related Cost, Incurred Cost	0.3	2.5
Corporate | Selling, general and administrative expenses | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	5.9
Restructuring and Related Cost, Incurred Cost	0.4	3.9
Corporate | Selling, general and administrative expenses | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	0.8
Restructuring and Related Cost, Incurred Cost	0.8	0.8
Corporate | Other, net | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	1.7
Restructuring and Related Cost, Incurred Cost		0.2
Corporate | Other, net | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	0.8
Restructuring and Related Cost, Incurred Cost	0.8	0.8
Commercial Foods | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	1.1
Restructuring and Related Cost, Incurred Cost		1.0
Commercial Foods | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	16.0
Restructuring and Related Cost, Incurred Cost		16.0
Commercial Foods | Severance and related costs | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	0.1
Restructuring and Related Cost, Incurred Cost		0.1
Commercial Foods | Selling, general and administrative expenses | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	1.1
Restructuring and Related Cost, Incurred Cost		1.0
Commercial Foods | Selling, general and administrative expenses | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	15.6
Restructuring and Related Cost, Incurred Cost		15.6
Commercial Foods | Other, net | Administrative Efficiency Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	1.1
Restructuring and Related Cost, Incurred Cost		1.0
Commercial Foods | Other, net | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	1.5
Restructuring and Related Cost, Incurred Cost		1.5
Commercial Foods | Inventory write-offs and related costs | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	0.4
Restructuring and Related Cost, Incurred Cost		0.4
Commercial Foods | Cost of goods sold | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	0.4
Restructuring and Related Cost, Incurred Cost		0.4
Commercial Foods | Asset impairment charge | Network Optimization Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	14.0
Restructuring and Related Cost, Incurred Cost		$ 14.0