PENSION AND POSTRETIREMENT BENEFITS - Schedule of Changes in Benefit Obligations and Plan Asset (Details) - USD ($) $ in Millions	12 Months Ended
	May 25, 2025	May 26, 2024	May 28, 2023
Pension Plan [Member]
PENSION AND POSTRETIREMENT BENEFITS
Benefit obligation at beginning of year	$ 2,574.7	$ 2,800.2
Service cost	5.5	5.8	$ 6.5
Interest cost	136.1	144.7	124.0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0.1	0.3
Actuarial loss (gain)	(148.6)	(31.2)
Plan settlements	(679.4)	(70.8)
Benefits paid	(194.6)	(274.3)
Benefit obligation at end of year	1,693.8	2,574.7	2,800.2
Fair value of plan assets at beginning of year	2,738.9	2,948.5
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	70.0	118.4
Employer contributions	11.9	12.2
Plan settlements	(679.4)	(65.9)
Benefits paid	(194.6)	(274.3)
Fair value of plan assets at end of year	1,946.8	2,738.9	2,948.5
Other Postretirement Benefits Plan [Member]
PENSION AND POSTRETIREMENT BENEFITS
Benefit obligation at beginning of year	48.1	53.2
Service cost	0.1	0.1	0.1
Interest cost	2.4	2.5	2.3
Actuarial loss (gain)	4.4	(0.8)
Benefits paid	(6.7)	(6.9)
Benefit obligation at end of year	48.3	48.1	53.2
Fair value of plan assets at beginning of year	3.7	3.5
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(3.7)	0.2
Employer contributions	6.7	6.9
Benefits paid	$ (6.7)	(6.9)
Fair value of plan assets at end of year		$ 3.7	$ 3.5