Quarterly report pursuant to Section 13 or 15(d)

Business Combinations - Additional Information (Details)

v3.10.0.1
Business Combinations - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Jul. 11, 2018
Jun. 30, 2018
Business Acquisition [Line Items]      
Goodwill acquired $ 360,428   $ 354,698
Privately-Held Company, September 30, 2018 Acquisition      
Business Acquisition [Line Items]      
Total purchase consideration 4,100    
Additional contingent consideration, liability 1,500    
Privately-Held Company, July 11, 2018 Acquisition      
Business Acquisition [Line Items]      
Total purchase consideration   $ 11,300  
Additional contingent consideration, liability $ 1,600 $ 4,500  
Product line from Keysight Technologies, Inc.      
Business Acquisition [Line Items]      
Total purchase consideration     12,100
Goodwill acquired     $ 5,200