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
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