Pension And Postretirement Benefits (Details 6) (USD $) In Millions	May 29, 2011	May 30, 2010
Fair value of plan assets
Total assets	$ 2,543.9	$ 2,144.6
Level 1 [Member]
Fair value of plan assets
Total assets	1,427.4	1,197.8
Level 1 [Member] | Cash and Cash Equivalents [Member]
Fair value of plan assets
Total assets	2.7	5.0
Level 1 [Member] | U.S equity securities [Member]
Fair value of plan assets
Total assets	625.7	537.2
Level 1 [Member] | International equity securities [Member]
Fair value of plan assets
Total assets	473.1	366.9
Level 1 [Member] | Government bonds [Member]
Fair value of plan assets
Total assets	53.4	160.4
Level 1 [Member] | Corporate bonds [Member]
Fair value of plan assets
Total assets	103.5	38.4
Level 1 [Member] | Mortgage-backed bonds [Member]
Fair value of plan assets
Total assets	31.5	32.3
Level 1 [Member] | Real Estate [Member]
Fair value of plan assets
Total assets	7.8	3.0
Level 1 [Member] | Master limited partnerships [Member]
Fair value of plan assets
Total assets	125.2	49.2
Level 1 [Member] | Net receivable for unsettled transactions [Member]
Fair value of plan assets
Total assets	4.5	5.4
Level 2 [Member]
Fair value of plan assets
Total assets	644.2	793.0
Level 2 [Member] | Cash and Cash Equivalents [Member]
Fair value of plan assets
Total assets	121.5	275.5
Level 2 [Member] | U.S equity securities [Member]
Fair value of plan assets
Total assets	7.7	42.1
Level 2 [Member] | International equity securities [Member]
Fair value of plan assets
Total assets	131.5	40.3
Level 2 [Member] | Government bonds [Member]
Fair value of plan assets
Total assets	155.1	160.2
Level 2 [Member] | Corporate bonds [Member]
Fair value of plan assets
Total assets	169.5	207.3
Level 2 [Member] | Mortgage-backed bonds [Member]
Fair value of plan assets
Total assets	58.9	67.6
Level 3 [Member]
Fair value of plan assets
Total assets	472.3	153.8
Level 3 [Member] | Real Estate [Member]
Fair value of plan assets
Total assets	70.3	61.4
Level 3 [Member] | Multi-strategy hedge funds [Member]
Fair value of plan assets
Total assets	346.0	22.1
Level 3 [Member] | Private equity [Member]
Fair value of plan assets
Total assets	56.0	39.1
Level 3 [Member] | Contracts with insurance companies [Member]
Fair value of plan assets
Total assets		31.2
Cash and Cash Equivalents [Member]
Fair value of plan assets
Total assets	124.2	280.5
U.S equity securities [Member]
Fair value of plan assets
Total assets	633.4	579.3
International equity securities [Member]
Fair value of plan assets
Total assets	604.6	407.2
Government bonds [Member]
Fair value of plan assets
Total assets	208.5	320.6
Corporate bonds [Member]
Fair value of plan assets
Total assets	273.0	245.7
Mortgage-backed bonds [Member]
Fair value of plan assets
Total assets	90.4	99.9
Real Estate [Member]
Fair value of plan assets
Total assets	78.1	64.4
Multi-strategy hedge funds [Member]
Fair value of plan assets
Total assets	346.0	22.1
Private equity [Member]
Fair value of plan assets
Total assets	56.0	39.1
Master limited partnerships [Member]
Fair value of plan assets
Total assets	125.2	49.2
Contracts with insurance companies [Member]
Fair value of plan assets
Total assets		31.2
Net receivable for unsettled transactions [Member]
Fair value of plan assets
Total assets	$ 4.5	$ 5.4