Business Combination (Summary of Preliminary Allocation of Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Aug. 09, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Goodwill		$ 330,184		$ 138,577
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		(408)	(408)
Net tangible assets		22,139	19,482
Identifiable intangible assets		53,400	53,400
Goodwill		191,607	194,264
Total intangible assets acquired		245,007	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
Net tangible assets		2,657
Goodwill	[1],[2],[3]	(2,657)
Total intangible assets acquired		$ (2,657)

[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