STOCKHOLDERS' EQUITY - Changes in AOCI (Details) $ in Millions	3 Months Ended
	Aug. 26, 2018 USD ($)
Changes in AOCI:
Balance at the beginning of the period	$ (334.8)
Balance at the end of the period	(245.4)
Accumulated Other Comprehensive Loss
Changes in AOCI:
Balance at the beginning of the period	(4.3)
Other comprehensive income before reclassifications, net of tax	(4.3)
Amounts reclassified out of AOCI, net of tax	0.1
Net current-period other comprehensive income (loss)	(4.2)
Balance at the end of the period	(8.5)
Foreign Currency Translation Gains (Losses)
Changes in AOCI:
Balance at the beginning of the period	(1.2)
Other comprehensive income before reclassifications, net of tax	(4.3)
Net current-period other comprehensive income (loss)	(4.3)
Balance at the end of the period	(5.5)
Pension and Post-Retirement Benefits
Changes in AOCI:
Balance at the beginning of the period	(3.1)
Amounts reclassified out of AOCI, net of tax	0.1
Net current-period other comprehensive income (loss)	0.1
Balance at the end of the period	$ (3.0)