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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
Feb. 28, 2013
May 31, 2012
May 31, 2011
Feb. 28, 2013
LVB Acquisition, Inc. [Member]
May 31, 2012
LVB Acquisition, Inc. [Member]
May 31, 2012
Restricted Stock Units [Member]
May 31, 2011
Restricted Stock Units [Member]
Feb. 10, 2011
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, par value $ 0 $ 0 $ 0 $ 0.01 $ 0.01      
Maximum number of shares of common stock authorized               4,000,000
Number of shares of common stock called per restricted stock unit               1
Award vesting period           5 years    
Unrecognized share-based compensation expense           $ 29.3    
Expected weighted average period of recognition           4 years    
Restricted Stock Units Outstanding [Roll Forward]                
Outstanding, beginning of period (shares)           3,835,000 0  
Granted (shares)           30,000 3,835,000  
Vested (shares)           0 0  
Forfeited (shares)           (200,000) 0  
Outstanding, end of period (shares)           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 $ 0.00  
Granted (usd per share)           $ 10.00 $ 10.00  
Vested (usd per share)           $ 0.00 $ 0.00  
Forfeited (usd per share)           $ 10.00 $ 0.00  
Outstanding, end of period (usd per share)           $ 10.00 $ 10.00