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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 0 Months Ended 0 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Feb. 01, 2013
Microsulis Medical Ltd [Member]
May 31, 2014
Microsulis Medical Ltd [Member]
Dec. 31, 2013
Microsulis Medical Ltd [Member]
Feb. 01, 2013
Microsulis Medical Ltd [Member]
May 22, 2012
Navilyst [Member]
May 22, 2012
Navilyst [Member]
Oct. 15, 2012
Vortex Medical [Member]
May 31, 2014
Vortex Medical [Member]
Oct. 15, 2012
Vortex Medical [Member]
Summary of estimated fair values of the assets acquired and liabilities assumed                        
Cash and cash equivalents                 $ 7,683     $ 339
Accounts receivable             364   19,069     203
Prepaid expenses and other current assets             443   5,504     7
Inventories             687   26,851     488
Fixed assets             1,906   34,017      
Deferred tax assets                 34,209     1,307
Intangibles             12,500   107,100     72,430
Other long-term assets                 497      
Goodwill 360,294 355,458 308,912   19,284   19,284   144,705   29,519 29,519
Total assets acquired             35,184   379,635     104,293
Deferred tax liabilities                       (28,340)
Liabilities assumed             (1,634)   (18,287)     (661)
Total purchase price             33,550   361,348     75,292
Cash payment at closing       10,566       97,000   15,105    
Cash payment for initial investment           5,000 5,000          
Working capital adjustment                   (115)    
Present value of deferred payment             4,820          
Present value of contingent consideration liability       13,164           60,302    
Total purchase price       $ 33,550       $ 361,000   $ 75,292