Business Combinations (Summary of Allocation of Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Goodwill	$ 331,159	$ 331,159	$ 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		19,232
Prepaid expenses and other current assets		3,924
Property and equipment		2,364
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		(483)
Net tangible assets		22,064
Identifiable intangible assets		52,500
Goodwill		192,582
Total intangible assets acquired		245,082
Total net assets acquired		$ 267,146