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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
May 22, 2012
Summary of estimated fair values of the assets acquired and liabilities assumed    
Intangibles   $ 107,100
Goodwill   145,221
Upfront payment 15,105,000  
Vortex Medical [Member]
    
Summary of estimated fair values of the assets acquired and liabilities assumed    
Cash and cash equivalents 339  
Accounts receivable 200  
Inventories 488  
Other assets 6  
Deferred tax assets 1,307  
Intangibles 72,430  
Goodwill 30,019  
Total assets acquired 104,789  
Deferred tax liabilities (28,451)  
Liabilities assumed (931)  
Total purchase price 75,407  
Upfront payment 15,105  
Present value of contingent consideration liability 60,302  
Total purchase price $ 75,407