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Accumulated Other Comprehensive Income - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)