Business Combinations (Narratives) (Details) $ in Thousands						12 Months Ended
	Aug. 09, 2019 USD ($)	Dec. 01, 2017 USD ($)	Oct. 27, 2017 USD ($)	Jul. 14, 2017 USD ($)	Mar. 07, 2017	Jun. 30, 2020 USD ($) Acquisition	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) Acquisition
Business Acquisition [Line Items]
Number of acquisitions completed | Acquisition						1		3
Acquisition and integration related expenses						$ 32,073	$ 3,444	$ 53,900
Recorded gain from bargain purchase								$ 5,030
Aerohive Networks, Inc.
Business Acquisition [Line Items]
Business acquisition, cash consideration	$ 267,146
Business acquisition, date of acquisition	Aug. 09, 2019
Revenue						125,100
Acquisition and integration related expenses						32,100
Compensation charge associated with acquisition						6,800
Accounts receivables	$ 11,753					11,753
Net assets acquired, identifiable intangible assets	$ 53,400					$ 52,500
Data Center Business
Business Acquisition [Line Items]
Business acquisition, cash consideration			$ 84,300
Asset purchase agreement closing date			Oct. 27, 2017
Accounts receivables			$ 33,488
Net assets acquired, identifiable intangible assets			$ 32,800
Campus Fabric Business
Business Acquisition [Line Items]
Asset purchase agreement closing date					Jul. 14, 2017
Business acquisition, provisional consideration				$ 79,400
Accounts receivables				19,527
Net assets acquired, identifiable intangible assets				$ 41,300
Capital Financing Business
Business Acquisition [Line Items]
Asset purchase agreement closing date		Dec. 01, 2017
Business combination, payments to seller in percentage of finance receivables		90.00%
Accounts receivables		$ 13,700
Net assets acquired, lease equipment		3,500
Net assets acquired, identifiable intangible assets		800
Fair value of contingent consideration		13,000
Recorded gain from bargain purchase		$ 5,000