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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Dec. 13, 2019	Dec. 31, 2019	Sep. 30, 2019
Business Acquisition [Line Items]
Goodwill		$ 214,804	$ 153,422
Opengear
Business Acquisition [Line Items]
Cash	$ 148,058
Contingent consideration	9,100
Total consideration transferred	157,158
Fair value of net tangible assets acquired	19,032
Deferred tax liability on identifiable intangible assets	(25,053)
Goodwill	60,479
Total assets acquired and liabilities assumed	157,158
Customer Relationships | Opengear
Business Acquisition [Line Items]
Identifiable intangible assets	81,000
Purchased and Core Technology | Opengear
Business Acquisition [Line Items]
Identifiable intangible assets	13,700
Trademarks | Opengear
Business Acquisition [Line Items]
Identifiable intangible assets	$ 8,000

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