Retirement Plans (Change In Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
May 27, 2018	May 28, 2017	May 29, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of period	$ 207.7
Employer contributions	60.4		$ 25.0
Fair value at end of period	253.8	$ 207.7
Defined Benefit Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of period	207.7	242.0
Actual return on plan assets	0.9	19.5
Employer contributions	60.8	0.4	25.4
Plan settlements	0.0	(44.2)
Benefits paid	(15.6)	(10.0)
Fair value at end of period	253.8	207.7	242.0
Postretirement Benefit Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of period	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	1.2	1.2	1.1
Plan settlements	0.0	0.0
Benefits paid	(1.2)	(1.2)
Fair value at end of period	$ 0.0	$ 0.0	$ 0.0

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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- Definition

Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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- Definition

Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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