STOCKHOLDERS' EQUITY - Changes in AOCI (Details) $ in Millions	3 Months Ended
	Aug. 25, 2019 USD ($)
Changes in AOCI:
Balance at the beginning of the period	$ (4.6)
Balance at the end of the period	92.3
Accumulated Other Comprehensive Loss
Changes in AOCI:
Balance at the beginning of the period	(25.3)
Other comprehensive income before reclassifications, net of tax	(9.1)
Amounts reclassified out of AOCI, net of tax	0.2
Net current-period other comprehensive income (loss)	(8.9)
Balance at the end of the period	(34.2)
Foreign Currency Translation Gains (Losses)
Changes in AOCI:
Balance at the beginning of the period	(20.3)
Other comprehensive income before reclassifications, net of tax	(9.1)
Net current-period other comprehensive income (loss)	(9.1)
Balance at the end of the period	(29.4)
Pension and Post-Retirement Benefits
Changes in AOCI:
Balance at the beginning of the period	(5.0)
Amounts reclassified out of AOCI, net of tax	0.2
Net current-period other comprehensive income (loss)	0.2
Balance at the end of the period	$ (4.8)