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Accumulated Other Comprehensive Income - Schedule of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning balance | $ 1,132,799 | $ 1,286,607 | $ 1,300,921
Other comprehensive loss, net of tax | (212,813) | 20,340 | 22,728
Balance, ending balance | 863,553 | 1,132,799 | 1,286,607
Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning balance | 1,583 | (11,530) | (24,951)
Other comprehensive loss, net of tax | (179,892) | 13,113 | 13,421
Balance, ending balance | (178,309) | 1,583 | (11,530)
Unrealized Losses on Hedging Activities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning balance | 0 | 0 | 0
Other comprehensive loss, net of tax | (3,874) | 0 | 0
Balance, ending balance | (3,874) | 0 | 0
Defined Benefit Pension Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning balance | (3,359) | (3,532) | (5,049)
Other comprehensive loss, net of tax | (450) | 173 | 1,517
Balance, ending balance | (3,809) | (3,359) | (3,532)
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning balance | (1,776) | (15,062) | (30,000)
Other comprehensive loss, net of tax | (184,216) | 13,286 | 14,938
Balance, ending balance | $ (185,992) | $ (1,776) | $ (15,062)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568447-111683 + Details
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