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2. Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2017
Feb. 15, 2017
Dec. 31, 2016
Jan. 06, 2016
Apr. 10, 2014
Business Acquisition [Line Items]              
Goodwill     $ 530,287   $ 477,115    
Goodwill, Acquired During Period     36,200        
RainDance Technologies, Inc. [Member]              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred $ 76,600            
Payments to Acquire Businesses, Net of Cash Acquired 72,800            
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed 10,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       $ 35,000      
Goodwill, Acquired During Period 36,200            
Liabilities Assumed $ 12,900            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       (3,800)      
Analytical Flow Cytometer Platform [Member]              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred   $ 32,800          
Payments to Acquire Businesses, Net of Cash Acquired   9,500          
Business Combination, Contingent Consideration, Liability     $ 26,700     $ 23,300  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles           $ 32,700  
Goodwill, Acquired During Period   $ 100          
GnuBIO [Member]              
Business Acquisition [Line Items]              
Business Combination, Contingent Consideration, Liability         $ 10,000   $ 10,700
Deferred Tax Asset [Domain] | RainDance Technologies, Inc. [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       $ 18,300