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Note 2 - Business Combinations (Details)
$ 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 ($)
Aug. 31, 2015
USD ($)
May. 31, 2015
USD ($)
May. 31, 2014
USD ($)
Note 2 - Business Combinations (Details) [Line Items]                
Payments to Acquire Businesses, Gross         $ 200      
Goodwill           $ 842,310 $ 842,258 $ 851,563
Business Combination, Contingent Consideration, Liability           $ 18,863 $ 18,596 $ 11,300
Reference Lab [Member]                
Note 2 - Business Combinations (Details) [Line Items]                
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]                
Note 2 - Business Combinations (Details) [Line Items]                
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            
Sentilus [Member] | Regulatory Milestones [Member]                
Note 2 - Business Combinations (Details) [Line Items]                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 4,000            
Sentilus [Member] | Arrangement 1 [Member] | Future Sales Targets [Member]                
Note 2 - Business Combinations (Details) [Line Items]                
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period   3 years            
Sentilus [Member] | Arrangement 2 [Member] | Regulatory Milestones [Member]                
Note 2 - Business Combinations (Details) [Line Items]                
Business Combination, Contingent Consideration Arrangements, Performance Based Payments, Period   20 years            
LIFECODES [Member]                
Note 2 - Business Combinations (Details) [Line Items]                
Payments to Acquire Businesses, Gross       $ 200        
Business Combination, Consideration Transferred   $ 400            
LIFECODES [Member] | Regulatory Milestones [Member]                
Note 2 - Business Combinations (Details) [Line Items]                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 200          
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period     2 years