v3.26.1

PENSION AND POSTRETIREMENT BENEFITS - Components of pension and postretirement plan costs (benefits) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 22, 2026	Feb. 23, 2025	Feb. 22, 2026	Feb. 23, 2025
Pension plan
PENSION AND POSTRETIREMENT BENEFITS
Service cost	$ 1.4	$ 1.4	$ 4.1	$ 4.1
Interest cost	22.0	34.4	66.2	101.8
Expected return on plan assets	(27.8)	(37.0)	(83.4)	(109.4)
Amortization of prior service cost (benefit)	0.4	0.4	1.2	1.2
Total pension and postretirement cost (benefit)	(1.9)	1.3	(4.7)	5.0
Pension plan \| Company plans
PENSION AND POSTRETIREMENT BENEFITS
Total pension and postretirement cost (benefit)	(4.0)	(0.8)	(11.9)	(2.3)
Pension plan \| Multi employer plan
PENSION AND POSTRETIREMENT BENEFITS
Total pension and postretirement cost (benefit)	2.1	2.1	7.2	7.3
Other postretirement benefits plan
PENSION AND POSTRETIREMENT BENEFITS
Service cost			0.1	0.1
Interest cost	0.6	0.6	1.7	1.8
Amortization of prior service cost (benefit)	(0.4)	(0.4)	(1.3)	(1.3)
Recognized net actuarial gain	(0.9)	(1.1)	(2.7)	(3.4)
Total pension and postretirement cost (benefit)	$ (0.7)	$ (0.9)	$ (2.2)	$ (2.8)

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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 net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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