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Note 2 - Business Combinations (Details Textual) - USD ($)
3 Months Ended
Mar. 04, 2016
Feb. 29, 2016
Aug. 03, 2015
Oct. 01, 2014
Aug. 01, 2014
May 30, 2014
Jan. 31, 2014
May 31, 2016
Aug. 31, 2014
May 31, 2015
Feb. 28, 2015
May 31, 2014
Sirona Genomics Inc. [Member] | Revenue Targets [Member]                        
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period 5 years                      
Sirona Genomics Inc. [Member] | Revenue Milestones [Member]                        
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period 5 years                      
Sirona Genomics Inc. [Member] | Other Noncurrent Liabilities [Member]                        
Business Combination, Contingent Consideration, Liability $ 20,000,000                      
Sirona Genomics Inc. [Member]                        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%                      
Payments to Acquire Businesses, Gross $ 15,000,000             $ 14,400,000        
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period 5 years                      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 45,000,000                      
Business Combination, Consideration Transferred 35,000,000                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 40,600,000                      
Goodwill 14,800,000                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 2,100,000                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 1,300,000                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities 1,500,000                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt 9,700,000                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent $ 12,500,000                      
Reference Lab [Member]                        
Payments to Acquire Businesses, Gross     $ 800,000                  
Goodwill     300,000                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     300,000                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 200,000                  
Sentilus [Member] | Regulatory Milestones [Member] | Arrangement 2 [Member]                        
Business Combination, Contingent Consideration Arrangements, Performance Based Payments, Period       20 years                
Sentilus [Member] | Regulatory Milestones [Member]                        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       $ 4,000,000                
Sentilus [Member] | Future Sales Targets [Member] | Arrangement 1 [Member]                        
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period       3 years                
Sentilus [Member] | Other Noncurrent Liabilities [Member]                        
Business Combination, Contingent Consideration, Liability       $ 6,300,000                
Sentilus [Member]                        
Payments to Acquire Businesses, Gross   $ 6,000,000   6,000,000                
Business Combination, Contingent Consideration, Liability   7,200,000                    
Business Combination, Consideration Transferred       12,300,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   18,800,000   18,800,000                
Goodwill   100,000   600,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   1,000,000                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent   $ 7,200,000   $ 7,200,000                
LIFECODES [Member] | UNITED KINGDOM                        
Business Combination, Consideration Transferred             $ 4,000,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents             1,200,000          
LIFECODES [Member] | ITALY                        
Business Combination, Consideration Transferred             2,400,000          
LIFECODES [Member]                        
Payments to Acquire Businesses, Gross                 $ 200,000      
Business Combination, Consideration Transferred         $ 400,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             3,500,000          
Goodwill             $ 1,100,000          
Organ-i [Member]                        
Payments to Acquire Businesses, Gross           $ 12,000,000            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High           18,000,000            
Business Combination, Contingent Consideration, Liability           11,300,000            
Business Combination, Consideration Transferred           23,300,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           26,700,000            
Goodwill           5,800,000         $ 5,600,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent           $ 9,100,000         $ 8,900,000  
Business Combination, Contingent Consideration, Liability               40,356,000   $ 18,596,000   $ 11,300,000
Goodwill               $ 857,023,000   $ 842,258,000   $ 851,563,000