PENSION AND POSTRETIREMENT BENEFITS - Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2024	May 28, 2023	May 29, 2022
Pension Plan [Member]
PENSION AND POSTRETIREMENT BENEFITS
Projected benefit obligation	$ 95.9	$ 101.6
Accumulated benefit obligation	95.9	101.6
Service cost	5.8	6.5	$ 8.7
Interest cost	144.7	124.0	83.3
Expected return on plan assets	(141.3)	(145.9)	(145.4)
Amortization of prior service cost (benefit)	1.6	1.4	1.9
Recognized net actuarial loss (gain)	(12.5)	0.1	(2.9)
Settlement gain	1.1
Total pension and postretirement cost (benefit)	8.4	(4.7)	(46.3)
Total pension and postretirement cost (benefit)	8.4	(4.7)	(46.3)
Pension Plan [Member] | Company Plans [Member]
PENSION AND POSTRETIREMENT BENEFITS
Total pension and postretirement cost (benefit)	(0.6)	(13.9)	(54.4)
Total pension and postretirement cost (benefit)	(0.6)	(13.9)	(54.4)
Pension Plan [Member] | Multi Employer Plans [Member]
PENSION AND POSTRETIREMENT BENEFITS
Total pension and postretirement cost (benefit)	9.0	9.2	8.1
Total pension and postretirement cost (benefit)	9.0	9.2	8.1
Other Postretirement Benefits Plan [Member]
PENSION AND POSTRETIREMENT BENEFITS
Service cost	0.1	0.1	0.2
Interest cost	2.5	2.3	1.3
Amortization of prior service cost (benefit)	(1.7)	(1.7)	(2.0)
Recognized net actuarial loss (gain)	(4.7)	(4.4)	(3.5)
Total pension and postretirement cost (benefit)	(3.8)	(3.7)	(4.0)
Total pension and postretirement cost (benefit)	(3.8)	(3.7)	(4.0)
Other Postretirement Benefits Plan [Member] | Company Plans [Member]
PENSION AND POSTRETIREMENT BENEFITS
Total pension and postretirement cost (benefit)	(3.8)	(3.7)	(4.0)
Total pension and postretirement cost (benefit)	$ (3.8)	$ (3.7)	$ (4.0)