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LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of effect on other comprehensive income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2015
Derivatives in cash flow hedging relationships: |  |  |  |
Amount of gain (loss) recognized in other comprehensive loss | $ 7,089 | $ (3,968) | $ 3,884 | $ (4,000)
Amount of loss recognized in interest expense | $ 1,768 | $ 2,467 | $ 3,665 | $ 4,201

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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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