PRE-TAX INCOME AND INCOME TAXES - Reconciliation of Income Taxes to the Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Income Tax Disclosure [Abstract]
Computed U.S. Federal income taxes	$ 219.0	$ 188.8	$ 285.3
State income taxes, net of U.S. Federal tax impact	29.6	34.1	18.0
Remeasurement of deferred taxes due to U.S. tax legislation	0.0	0.0	(241.6)
Transition tax on foreign earnings	0.0	(4.6)	19.8
Tax credits and domestic manufacturing deduction	(9.7)	(5.6)	(20.6)
Federal rate differential on legal reserve	0.0	0.0	12.6
Goodwill and intangible impairments	11.2	12.5	0.0
Remeasurement of deferred taxes due to legal entity reorganization	(40.9)	16.9	0.0
State tax impact of combining Pinnacle business	0.0	(12.0)	0.0
Change of valuation allowance on capital loss carryforward	0.0	(32.2)	78.6
Other	(7.9)	20.9	22.5
Total provision for income taxes	$ 201.3	$ 218.8	$ 174.6