PENSION AND POSTRETIREMENT BENEFITS - Schedule of Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
May 27, 2018	May 28, 2017	May 29, 2016
Change in Plan Assets
Fair value of plan assets at beginning of year	$ 2,983.6
Fair value of plan assets at end of year	3,355.1	$ 2,983.6
Pension Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	3,548.7	3,903.0
Service cost	42.8	56.9	$ 93.8
Interest cost	111.1	116.8	159.8
Plan participants' contributions	0.0	0.0
Amendments	0.6	5.5
Actuarial gain	(9.4)	(51.5)
Plan settlements	(10.2)	(287.5)
Special termination benefits	0.0	1.5
Curtailments	(79.5)	(18.1)
Benefits paid	(181.3)	(169.7)
Currency	0.8	(0.8)
Business divestitures	0.0	(7.4)
Benefit obligation at end of year	3,423.6	3,548.7	3,903.0
Change in Plan Assets
Fair value of plan assets at beginning of year	2,983.6	2,959.4
Actual return on plan assets	276.1	346.1
Employer contributions	312.6	163.0
Plan participants' contributions	0.0	0.0
Plan settlements	(10.2)	(287.5)
Investment and administrative expenses	(26.5)	(26.7)
Benefits paid	(181.3)	(169.7)
Currency	0.8	(1.0)
Fair value of plan assets at end of year	3,355.1	2,983.6	2,959.4
Other Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	156.9	201.7
Service cost	0.2	0.3	0.4
Interest cost	3.9	4.6	7.5
Plan participants' contributions	4.7	4.7
Amendments	(17.2)	0.0
Actuarial gain	(13.2)	(32.0)
Plan settlements	0.0	0.0
Special termination benefits	0.0	0.0
Curtailments	0.0	0.0
Benefits paid	(16.2)	(19.0)
Currency	0.2	(0.2)
Business divestitures	0.0	(3.2)
Benefit obligation at end of year	119.3	156.9	201.7
Change in Plan Assets
Fair value of plan assets at beginning of year	0.0	0.1
Actual return on plan assets	3.7	0.0
Employer contributions	11.5	14.2
Plan participants' contributions	4.7	4.7
Plan settlements	0.0	0.0
Investment and administrative expenses	0.0	0.0
Benefits paid	(16.2)	(19.0)
Currency	0.0	0.0
Fair value of plan assets at end of year	$ 3.7	$ 0.0	$ 0.1

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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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. 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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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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

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Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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Amount of decrease in benefit obligation of defined benefit plan from disposal or classification as held-for-sale.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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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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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

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