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Business Combinations (PDX, Inc. - Summary of Information Related to Acquisition) (Details) - USD ($)
$ in Thousands
Jun. 01, 2020
Sep. 30, 2020
Mar. 31, 2020
Business Acquisition [Line Items]      
Goodwill   $ 4,126,481 $ 3,795,325
PDX, Inc. [Member]      
Business Acquisition [Line Items]      
Cash $ 755    
Accounts receivable, net of allowance for doubtful accounts 5,739    
Prepaid expenses and other current assets 2,251    
Property and equipment 840    
Goodwill 98,830    
Other noncurrent assets 690    
Accounts payable (3,882)    
Deferred revenue, current (2,946)    
Accrued expenses and other current liabilities (3,364)    
Other long-term liabilities (222)    
Total consideration transferred 198,291    
Accounts receivable, allownace for doubtful accounts 1,092    
Customer Relationships [Member] | PDX, Inc. [Member]      
Business Acquisition [Line Items]      
Identified intangible assets $ 74,300    
Useful life 18 years    
Technology-Based Intangible Assets [Member] | PDX, Inc. [Member]      
Business Acquisition [Line Items]      
Identified intangible assets $ 25,300    
Technology-Based Intangible Assets [Member] | PDX, Inc. [Member] | Minimum [Member]      
Business Acquisition [Line Items]      
Useful life 10 years    
Technology-Based Intangible Assets [Member] | PDX, Inc. [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Useful life 11 years