PENSION AND POSTRETIREMENT BENEFITS (Expected to be Recognized as Components) (Details) $ in Millions	12 Months Ended
May. 31, 2015 USD ($)
Pension Benefits
Accumulated other comprehensive income (loss)
Prior service cost (benefit)	$ 2.7
Other Benefits
Accumulated other comprehensive income (loss)
Prior service cost (benefit)	$ (8.1)

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

No definition available.

Name:	us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration