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Share-based Compensation and Stock Plans - Restricted Stock Units (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Feb. 10, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, par value $ 0.01 $ 0.01    
Restricted Stock Units Outstanding [Roll Forward]        
Modification impact (shares) (3,665,000)      
Restricted Stock Units Outstanding, Weighted Average Exercise Price [Roll Forward]        
Modification impact (usd per share) $ 10.00      
LVB Acquisition, Inc. [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, par value $ 0.01      
Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock called per restricted stock unit       1
Award vesting period 5 years      
Unrecognized share-based compensation expense $ 18.7      
Expected weighted average period of recognition 3 years 0 months      
Restricted Stock Units Outstanding [Roll Forward]        
Outstanding, beginning of period (shares) 3,665,000 3,835,000 0  
Granted (shares) 13,631,500 30,000 3,835,000  
Vested (shares) 0 0 0  
Forfeited (shares) (578,000) (200,000) 0  
Outstanding, end of period (shares) 13,053,500 3,665,000 3,835,000  
Restricted Stock Units Outstanding, Weighted Average Exercise Price [Roll Forward]        
Outstanding, beginning of period (usd per share) $ 10.00 $ 10.00 $ 0.00  
Granted (usd per share) $ 7.88 $ 10.00 $ 10.00  
Vested (usd per share) $ 0.00 $ 0.00 $ 0.00  
Forfeited (usd per share) $ 7.88 $ 10.00 $ 0.00  
Outstanding, end of period (usd per share) $ 7.88 $ 10.00 $ 10.00