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Business Combinations (Summary of Final Allocation of Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Oct. 27, 2017 | Jul. 14, 2017
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 331,159 | $ 138,577 | $ 139,082 |  |
Data Center Business |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Accounts receivables |  |  |  | $ 33,488 |
Inventories |  |  |  | 19,934 |
Prepaid expenses and other current assets |  |  |  | 988 |
Property and equipment |  |  |  | 19,442 |
Other assets |  |  |  | 4,734 |
Accounts payable and accrued expenses |  |  |  | (16,494) |
Deferred revenue |  |  |  | (33,025) |
Total tangible assets acquired and liabilities assumed |  |  |  | 29,067 |
Identifiable intangible assets |  |  |  | 32,800 |
Goodwill |  |  |  | 22,470 |
Total intangible assets acquired |  |  |  | 55,270 |
Total net assets acquired |  |  |  | $ 84,337 |
Campus Fabric Business |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Accounts receivables |  |  |  |  | $ 19,527
Inventories |  |  |  |  | 14,165
Prepaid expenses and other current assets |  |  |  |  | 240
Property and equipment |  |  |  |  | 5,406
Other assets |  |  |  |  | 7,009
Accounts payable and accrued expenses |  |  |  |  | (31,670)
Deferred revenue |  |  |  |  | (8,994)
Other long-term liabilities |  |  |  |  | (5,849)
Total tangible assets acquired and liabilities assumed |  |  |  |  | (166)
Identifiable intangible assets |  |  |  |  | 41,300
In-process research and development |  |  |  |  | 2,400
Goodwill |  |  |  |  | 35,892
Total intangible assets acquired |  |  |  |  | 79,592
Total net assets acquired |  |  |  |  | $ 79,426

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