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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2016 | May 31, 2015 | May 31, 2014
Commitments and Contingencies Disclosure [Abstract] |  |  |
Rent expense on operating leases | $ 19.7 | $ 17.5 | $ 16.0

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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