SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Feb. 24, 2019	Feb. 25, 2018	Nov. 26, 2017	Aug. 27, 2017	Feb. 24, 2019	Feb. 25, 2018	May 28, 2018	May 27, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unrealized gain on securities	$ 0.0	$ 0.6	$ 0.2	$ 0.2	$ 0.0	$ 1.0
Receivables, less allowance for doubtful accounts	870.2				870.2			$ 569.4
Inventories	1,638.6				1,638.6			988.7
Prepaid expenses and other current assets	107.6				107.6			184.9
Other accrued liabilities	851.8				851.8			671.0
Other noncurrent liabilities	1,918.8				1,918.8			1,060.8
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings							$ 0.5
Accounting Standards Update 2014-09 | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings							$ 0.5
Adjustments | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings								0.5
Receivables, less allowance for doubtful accounts	9.6				9.6			(7.6)
Inventories	(4.4)				(4.4)			2.8
Prepaid expenses and other current assets	(7.1)				(7.1)			6.9
Other accrued liabilities	(1.1)				(1.1)			1.4
Other noncurrent liabilities	$ (0.2)				$ (0.2)			$ 0.2