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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASU 2016-02 - Impact of Adoption (Details) - USD ($) $ in Millions		9 Months Ended
	May 27, 2019	Feb. 23, 2020	Feb. 24, 2019	May 26, 2019
New and Recently Issued Accounting Standards
Operating lease assets		$ 172.4
Operating lease liability		175.3
Cumulative adjustment to increase retained earnings, net of tax		20.5	$ 13.7
Property, plant and equipment, net		1,554.0		$ 1,597.8
Long-term debt and financing obligations, excluding current portion		$ 2,195.3		$ 2,280.2
Accounting Standards Update 2016-02
New and Recently Issued Accounting Standards
Operating lease assets	$ 155.0
Cumulative adjustment to increase retained earnings, before tax	26.6
Cumulative adjustment to increase retained earnings, net of tax	20.5
Accounting Standards Update 2016-02 \| Restatement Adjustment
New and Recently Issued Accounting Standards
Property, plant and equipment, net	(38.7)
Long-term debt and financing obligations, excluding current portion	$ (65.3)