Quarterly report pursuant to Section 13 or 15(d)

Business Combinations - Other Fiscal 2019 and 2018 Acquisitions Additional Information (Details)

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Business Combinations - Other Fiscal 2019 and 2018 Acquisitions Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
company
Sep. 30, 2018
USD ($)
company
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Business Acquisition        
Goodwill $ 2,172,902,000   $ 2,172,902,000 $ 354,698,000
Three privately-held companies        
Business Acquisition        
Number of companies acquired | company 3      
Total purchase consideration $ 118,000,000      
Additional consideration (up to) 13,000,000.0   13,000,000.0  
Additional contingent consideration, liability 4,800,000   4,800,000  
Two privately-held companies        
Business Acquisition        
Number of companies acquired | company   2    
Total purchase consideration   $ 15,400,000    
Additional consideration (up to)   $ 6,000,000.0    
Additional contingent consideration, liability 1,900,000   1,900,000  
Acquisition of privately-held companies in 2019        
Business Acquisition        
Revenue of acquiree since acquisition 2,300,000   3,100,000  
Net income of acquiree since acquisition 2,800,000   3,500,000  
Acquisition-related costs     37,200,000  
Goodwill $ 43,357,000   $ 43,357,000  
Product line from Keysight Technologies, Inc.        
Business Acquisition        
Total purchase consideration       12,100,000
Goodwill       $ 5,200,000