Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
Feb. 28, 2014
May 31, 2013
Feb. 28, 2013
Liabilities:      
Fair value of long-term debt $ 6,017,900,000 $ 6,090,400,000  
Carrying value of long-term debt 5,831,700,000 5,966,400,000  
Fair value of assets measured on a nonrecurring basis 0   0
Fair value of liabilities measured on a nonrecurring basis 0   0
Recurring [Member]
      
Assets:      
Total assets, Fair Value 286,300,000 269,700,000  
Liabilities:      
Total liabilities, Fair Value 22,500,000 54,700,000  
Recurring [Member] | Money market funds [Member]
      
Assets:      
Total assets, Fair Value 110,800,000 93,100,000  
Recurring [Member] | Time deposit [Member]
      
Assets:      
Total assets, Fair Value 17,000,000 31,500,000  
Recurring [Member] | Greek bonds [Member]
      
Assets:      
Total assets, Fair Value 7,700,000 5,600,000  
Recurring [Member] | Pension plan assets [Member]
      
Assets:      
Total assets, Fair Value 147,600,000 137,600,000  
Recurring [Member] | Foreign currency exchange contracts [Member]
      
Assets:      
Total assets, Fair Value 900,000 500,000  
Liabilities:      
Total liabilities, Fair Value 100,000 600,000  
Recurring [Member] | Equity securities [Member]
      
Assets:      
Total assets, Fair Value 2,300,000 1,400,000  
Recurring [Member] | Interest rate swaps [Member]
      
Liabilities:      
Total liabilities, Fair Value 22,400,000 54,100,000  
Recurring [Member] | Level 1 [Member]
      
Assets:      
Total assets, Fair Value 113,000,000 94,400,000  
Liabilities:      
Total liabilities, Fair Value 0 0  
Recurring [Member] | Level 1 [Member] | Money market funds [Member]
      
Assets:      
Total assets, Fair Value 110,800,000 93,100,000  
Recurring [Member] | Level 1 [Member] | Time deposit [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 1 [Member] | Greek bonds [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 1 [Member] | Pension plan assets [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 1 [Member] | Foreign currency exchange contracts [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Liabilities:      
Total liabilities, Fair Value 0 0  
Recurring [Member] | Level 1 [Member] | Equity securities [Member]
      
Assets:      
Total assets, Fair Value 2,200,000 1,300,000  
Recurring [Member] | Level 1 [Member] | Interest rate swaps [Member]
      
Liabilities:      
Total liabilities, Fair Value 0 0  
Recurring [Member] | Level 2 [Member]
      
Assets:      
Total assets, Fair Value 173,200,000 175,200,000  
Liabilities:      
Total liabilities, Fair Value 22,500,000 54,700,000  
Recurring [Member] | Level 2 [Member] | Money market funds [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 2 [Member] | Time deposit [Member]
      
Assets:      
Total assets, Fair Value 17,000,000 31,500,000  
Recurring [Member] | Level 2 [Member] | Greek bonds [Member]
      
Assets:      
Total assets, Fair Value 7,700,000 5,600,000  
Recurring [Member] | Level 2 [Member] | Pension plan assets [Member]
      
Assets:      
Total assets, Fair Value 147,600,000 137,600,000  
Recurring [Member] | Level 2 [Member] | Foreign currency exchange contracts [Member]
      
Assets:      
Total assets, Fair Value 900,000 500,000  
Liabilities:      
Total liabilities, Fair Value 100,000 600,000  
Recurring [Member] | Level 2 [Member] | Equity securities [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 2 [Member] | Interest rate swaps [Member]
      
Liabilities:      
Total liabilities, Fair Value 22,400,000 54,100,000  
Recurring [Member] | Level 3 [Member]
      
Assets:      
Total assets, Fair Value 100,000 100,000  
Liabilities:      
Total liabilities, Fair Value 0 0  
Recurring [Member] | Level 3 [Member] | Money market funds [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 3 [Member] | Time deposit [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 3 [Member] | Greek bonds [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 3 [Member] | Pension plan assets [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Recurring [Member] | Level 3 [Member] | Foreign currency exchange contracts [Member]
      
Assets:      
Total assets, Fair Value 0 0  
Liabilities:      
Total liabilities, Fair Value 0 0  
Recurring [Member] | Level 3 [Member] | Equity securities [Member]
      
Assets:      
Total assets, Fair Value 100,000 100,000  
Recurring [Member] | Level 3 [Member] | Interest rate swaps [Member]
      
Liabilities:      
Total liabilities, Fair Value $ 0 $ 0