RESTRUCTURING ACTIVITIES - Schedule of Liabilities Recorded for the Restructuring Plan (Details) - Pinnacle Integration Restructuring Plan $ in Millions	9 Months Ended
	Feb. 24, 2019 USD ($)
Restructuring Cost and Reserve
May 27, 2018	$ 0.0
Costs Incurred and Charged to Expense	141.2
Costs Paid or Otherwise Settled	(40.8)
Changes in Estimates	(3.0)
February 24, 2019	97.4
Severance and related costs
Restructuring Cost and Reserve
May 27, 2018	0.0
Costs Incurred and Charged to Expense	109.2
Costs Paid or Otherwise Settled	(29.6)
Changes in Estimates	(3.0)
February 24, 2019	76.6
Contract/lease termination
Restructuring Cost and Reserve
May 27, 2018	0.0
Costs Incurred and Charged to Expense	0.8
Costs Paid or Otherwise Settled	0.0
Changes in Estimates	0.0
February 24, 2019	0.8
Consulting/professional fees
Restructuring Cost and Reserve
May 27, 2018	0.0
Costs Incurred and Charged to Expense	24.2
Costs Paid or Otherwise Settled	(4.6)
Changes in Estimates	0.0
February 24, 2019	19.6
Other costs
Restructuring Cost and Reserve
May 27, 2018	0.0
Costs Incurred and Charged to Expense	7.0
Costs Paid or Otherwise Settled	(6.6)
Changes in Estimates	0.0
February 24, 2019	$ 0.4