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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Income Tax Contingency [Line Items] |  |  |
U.S. statutory rate | 21.00% |  |
Effective income tax rate (benefit) expense | (10.00%) | 18.20% |
Unrecognized tax benefits that would impact effective tax rate | $ 74.0 |  | $ 11.5
Interest and penalties accrued | 15.6 |  | $ 1.2
Liability for uncertain tax positions | 70.3 |  |
Finisar Corporation |  |  |
Income Tax Contingency [Line Items] |  |  |
Liability for uncertain tax positions | $ 64.0 |  |
United States Internal Revenue Service | Earliest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax year remain open to examination | 2017 |  |
United States Internal Revenue Service | Latest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax year remain open to examination | 2020 |  |
State Jurisdictions | Earliest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax year remain open to examination | 2015 |  |
State Jurisdictions | Latest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax year remain open to examination | 2020 |  |
Foreign Taxing Jurisdictions | Earliest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax year remain open to examination | 2009 |  |
Foreign Taxing Jurisdictions | Latest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax year remain open to examination | 2020 |  |
Subsidiaries in Philippines |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2017 |  |
Subsidiary in Germany | Earliest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2012 |  |
Subsidiary in Germany | Latest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2015 |  |
Subsidiary in Florida | Earliest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2016 |  |
Subsidiary in Florida | Latest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2018 |  |
Subsidiary in Vietnam | Earliest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2018 |  |
Subsidiary in Vietnam | Latest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2019 |  |
Subsidiary in Australia | Earliest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2011 |  |
Subsidiary in Australia | Latest Tax Year |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2014 |  |
Subsidiary in India |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax examination, year(s) under examination | 2016 |  |

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