Business Combinations (Summary of Allocation of Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Aug. 09, 2019	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Goodwill		$ 331,159		$ 138,577	$ 139,082
Aerohive Networks, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents		44,158	$ 44,158
Short-term investments		45,148	45,148
Accounts receivable, net		11,753	11,753
Inventories		19,232	16,698
Prepaid expenses and other current assets		3,924	3,980
Property and equipment		2,364	2,185
Operating lease right-of-use assets		6,336	6,336
Other assets		2,195	2,195
Debt		(20,000)	(20,000)
Accounts payable		(9,737)	(9,737)
Accrued compensation and benefits		(7,129)	(7,129)
Accrued warranty		(570)	(570)
Other accrued liabilities		(1,960)	(1,960)
Operating lease liabilities		(4,752)	(4,752)
Deferred revenue		(68,415)	(68,415)
Other liabilities		(483)	(408)
Net tangible assets		22,064	19,482
Identifiable intangible assets		52,500	53,400
Goodwill		192,582	194,264
Total intangible assets acquired		245,082	247,664
Total net assets acquired		267,146	$ 267,146
Aerohive Networks, Inc. | Adjustments
Business Acquisition [Line Items]
Inventories	[1]	2,534
Prepaid expenses and other current assets	[2]	(56)
Property and equipment	[3]	179
Other liabilities		(75)
Net tangible assets		2,582
Identifiable intangible assets	[4]	(900)
Goodwill	[1],[2],[3],[4]	(1,682)
Total intangible assets acquired		$ (2,582)

[1] adjustment of the fair value of inventories acquired

[2] write-off of an asset with no future economic value as of the Acquisition Date

[3] adjustment to the value of property and equipment as of the Acquisition Date at an international location

[4] adjustment to the fair value of intangibles,