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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning balance     $ 863,553 $ 1,132,799
Other comprehensive income (loss), net of income tax $ (38,777) $ (90,305) (63,614) (113,009)
Balance, ending balance 926,099 1,022,236 926,099 1,022,236
Other comprehensive income (loss) attributable to noncontrolling interest (6,300) (6,900) (4,400) (12,100)
Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning balance (206,124) (15,992) (178,309) 1,583
Other comprehensive income (loss), net of income tax (31,568) (80,930) (59,383) (98,505)
Balance, ending balance (237,692) (96,922) (237,692) (96,922)
Unrealized Gains (Losses) on Hedging Activities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning balance (2,794) 0 (3,874) 0
Other comprehensive income (loss), net of income tax (939) (2,445) 141 (2,445)
Balance, ending balance (3,733) (2,445) (3,733) (2,445)
Defined Benefit Pension Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning balance (3,809) (3,359) (3,809) (3,359)
Other comprehensive income (loss), net of income tax 0 0 0 0
Balance, ending balance (3,809) (3,359) (3,809) (3,359)
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning balance (212,727) (19,351) (185,992) (1,776)
Other comprehensive income (loss), net of income tax (32,507) (83,375) (59,242) (100,950)
Balance, ending balance $ (245,234) $ (102,726) $ (245,234) $ (102,726)