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Long-Term Debt, Derivatives and Letters of Credit - Amounts Recognized in Other Comprehensive Income, and Reclassified Into Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2015 | Aug. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Other Comprehensive Income | $ (238) | $ 597
Net Investment Hedge [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Other Comprehensive Income | (238) | 597
Gain (Loss) Reclassified from Other Comprehensive Income to Earnings | $ 0 | $ 0

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + 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=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959 + Details
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- Definition Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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