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Business Combinations (PDX, Inc. - Summary of Information Related to Acquisition) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]        
Cash $ 755      
Accounts receivable 5,739      
Prepaid expenses and other current assets 2,251      
Property and equipment 840      
Goodwill 98,830 $ 4,108,792 $ 3,795,325
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      
Customer Relationships [Member]        
Business Acquisition [Line Items]        
Identified intangible assets $ 74,300      
Customer Relationships [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Useful life   12 years    
Customer Relationships [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Useful life   18 years    
Customer Relationships [Member] | PDX, Inc. [Member]        
Business Acquisition [Line Items]        
Useful life 18 years      
Technology-Based Intangible Assets [Member]        
Business Acquisition [Line Items]        
Identified intangible assets $ 25,300      
Technology-Based Intangible Assets [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Useful life   6 years    
Technology-Based Intangible Assets [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Useful life   12 years    
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