Business Combination (Summary of Preliminary Allocation of Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Aug. 09, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Goodwill	$ 332,841		$ 138,577
Aerohive Networks, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents		$ 44,158
Short-term investments		45,148
Accounts receivable, net		11,753
Inventories		16,698
Prepaid expenses and other current assets		3,980
Property and equipment		2,185
Operating lease right-of-use assets		6,336
Other assets		2,195
Debt		(20,000)
Accounts payable		(9,737)
Accrued compensation and benefits		(7,129)
Accrued warranty		(570)
Other accrued liabilities		(1,960)
Operating lease liabilities		(4,752)
Deferred revenue		(68,415)
Other liabilities		(408)
Net tangible assets		19,482
Identifiable intangible assets		53,400
Goodwill		194,264
Total intangible assets acquired		247,664
Total net assets acquired		$ 267,146