SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions	Feb. 23, 2020	May 27, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total lease assets	$ 221.4
Total lease liabilities	$ 265.2
Accounting Standards Update 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total lease assets		$ 238.4
Total lease liabilities		$ 267.0