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Note 2 - Business Combinations (Details Textual)
$ in Thousands
3 Months Ended
Aug. 03, 2015
USD ($)
Oct. 01, 2014
USD ($)
Aug. 01, 2014
USD ($)
Nov. 30, 2014
USD ($)
Aug. 31, 2014
USD ($)
Nov. 30, 2015
USD ($)
Aug. 31, 2015
USD ($)
May. 31, 2015
USD ($)
May. 31, 2014
USD ($)
LIFECODES [Member]                  
Payments to Acquire Businesses, Gross       $ 200 $ 200        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High           $ 200      
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period     2 years            
Business Combination, Consideration Transferred     $ 400            
Reference Lab [Member]                  
Payments to Acquire Businesses, Gross $ 800                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 300                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 200                
Goodwill $ 300                
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              
Sentilus [Member] | Future Sales Targets [Member] | Arrangement 1 [Member]                  
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period   3 years              
Sentilus [Member]                  
Payments to Acquire Businesses, Gross   $ 6,000              
Goodwill   $ 600              
Business Combination, Number of Contingent Consideration Arrangements   2              
Business Combination, Contingent Consideration, Liability   $ 6,300              
Business Combination, Consideration Transferred   12,300              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   18,800              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent   $ 7,200              
Goodwill           840,507   $ 842,258 $ 851,563
Business Combination, Contingent Consideration, Liability           $ 19,127 $ 18,596 $ 18,596 $ 11,300