Restructuring - Summary of Expected Realization and Incurred Restructuring Pre-Tax Expenses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	30 Months Ended
	Nov. 25, 2012	Nov. 25, 2012	Nov. 25, 2012
Acquisition-Related Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		$ 10.5
Restructuring and related cost, incurred cost	2.2	4.0	8.5
Administrative Efficiency Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		19.2
Restructuring and related cost, incurred cost	0.9	1.5	18.2
Administrative Efficiency Restructuring Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		14.2
Restructuring and related cost, incurred cost	0.7	1.3	13.4
Administrative Efficiency Restructuring Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		1.1
Restructuring and related cost, incurred cost			1.0
Administrative Efficiency Restructuring Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		3.9
Restructuring and related cost, incurred cost	0.2	0.2	3.8
Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		81.4
Restructuring and related cost, incurred cost		4.5	76.9
Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		64.6
Restructuring and related cost, incurred cost	0.7	3.7	60.1
Network Optimization Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		16.0
Restructuring and related cost, incurred cost			16.0
Network Optimization Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		0.8
Restructuring and related cost, incurred cost		0.8	0.8
Severance and Related Costs [Member] | Acquisition-Related Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		9.9
Restructuring and related cost, incurred cost	2.1	3.6	7.9
Severance and Related Costs [Member] | Administrative Efficiency Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		9.4
Restructuring and related cost, incurred cost	0.4	0.9	9.3
Severance and Related Costs [Member] | Administrative Efficiency Restructuring Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		7.2
Restructuring and related cost, incurred cost	0.3	0.9	7.1
Severance and Related Costs [Member] | Administrative Efficiency Restructuring Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		2.2
Restructuring and related cost, incurred cost	0.1		2.2
Severance and Related Costs [Member] | Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		10.0
Restructuring and related cost, incurred cost		0.2	9.8
Severance and Related Costs [Member] | Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		9.9
Restructuring and related cost, incurred cost	0.2	0.2	9.7
Severance and Related Costs [Member] | Network Optimization Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		0.1
Restructuring and related cost, incurred cost			0.1
Other, Net [Member] | Acquisition-Related Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		0.6
Restructuring and related cost, incurred cost	0.1	0.6	0.6
Other, Net [Member] | Administrative Efficiency Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		8.3
Restructuring and related cost, incurred cost	0.4	0.4	7.6
Other, Net [Member] | Administrative Efficiency Restructuring Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		7.0
Restructuring and related cost, incurred cost	0.4	0.4	6.3
Other, Net [Member] | Administrative Efficiency Restructuring Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		1.1
Restructuring and related cost, incurred cost			1.0
Other, Net [Member] | Administrative Efficiency Restructuring Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		0.2
Restructuring and related cost, incurred cost			0.3
Other, Net [Member] | Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		12.3
Restructuring and related cost, incurred cost		2.9	10.6
Other, Net [Member] | Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		10.0
Restructuring and related cost, incurred cost	0.4	2.1	8.3
Other, Net [Member] | Network Optimization Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		1.5
Restructuring and related cost, incurred cost			1.5
Other, Net [Member] | Network Optimization Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		0.8
Restructuring and related cost, incurred cost		0.8	0.8
Selling, General and Administrative Expenses [Member] | Acquisition-Related Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		10.5
Restructuring and related cost, incurred cost	2.2	4.2	8.5
Selling, General and Administrative Expenses [Member] | Administrative Efficiency Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		19.2
Restructuring and related cost, incurred cost	0.9	1.5	18.2
Selling, General and Administrative Expenses [Member] | Administrative Efficiency Restructuring Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		14.2
Restructuring and related cost, incurred cost	0.7	1.3	13.4
Selling, General and Administrative Expenses [Member] | Administrative Efficiency Restructuring Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		1.1
Restructuring and related cost, incurred cost			1.0
Selling, General and Administrative Expenses [Member] | Administrative Efficiency Restructuring Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		3.9
Restructuring and related cost, incurred cost	0.2	0.2	3.8
Selling, General and Administrative Expenses [Member] | Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		49.0
Restructuring and related cost, incurred cost		2.4	47.0
Selling, General and Administrative Expenses [Member] | Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		32.6
Restructuring and related cost, incurred cost	0.2	1.6	30.6
Selling, General and Administrative Expenses [Member] | Network Optimization Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		15.6
Restructuring and related cost, incurred cost			15.6
Selling, General and Administrative Expenses [Member] | Network Optimization Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		0.8
Restructuring and related cost, incurred cost		0.8	0.8
Other [Member] | Acquisition-Related Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost		(0.2)
Cost of Goods Sold [Member] | Acquisition-Related Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost		(0.2)
Cost of Goods Sold [Member] | Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		32.4
Restructuring and related cost, incurred cost		2.1	29.9
Cost of Goods Sold [Member] | Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		32.0
Restructuring and related cost, incurred cost	0.5	2.1	29.5
Cost of Goods Sold [Member] | Network Optimization Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		0.4
Restructuring and related cost, incurred cost			0.4
Accelerated Depreciation [Member] | Administrative Efficiency Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		1.5
Restructuring and related cost, incurred cost	0.1	0.2	1.3
Accelerated Depreciation [Member] | Administrative Efficiency Restructuring Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		1.5
Restructuring and related cost, incurred cost	0.1	0.2	1.3
Accelerated Depreciation [Member] | Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		22.6
Restructuring and related cost, incurred cost		2.0	22.5
Accelerated Depreciation [Member] | Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		22.6
Restructuring and related cost, incurred cost	0.4	2.0	22.5
Inventory Write-Offs and Related Costs [Member] | Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		9.8
Restructuring and related cost, incurred cost		0.1
Inventory write-offs and related costs			7.4
Inventory Write-Offs and Related Costs [Member] | Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		9.4
Restructuring and related cost, incurred cost		0.1
Inventory write-offs and related costs	0.1		7.0
Inventory Write-Offs and Related Costs [Member] | Network Optimization Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		0.4
Inventory write-offs and related costs			0.4
Asset Impairment [Member] | Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		27.7
Restructuring and related cost, incurred cost		0.3	27.6
Asset Impairment [Member] | Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		13.7
Restructuring and related cost, incurred cost		0.3	13.6
Asset Impairment [Member] | Network Optimization Plan [Member] | Commercial Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		14.0
Restructuring and related cost, incurred cost			14.0
Gain on Sale of Property, Plant and Equipment [Member] | Network Optimization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		(1.0)
Restructuring and related cost, incurred cost		(1.0)	(1.0)
Gain on Sale of Property, Plant and Equipment [Member] | Network Optimization Plan [Member] | Consumer Foods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		(1.0)
Restructuring and related cost, incurred cost	$ (0.4)	$ (1.0)	$ (1.0)