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Basis of Presentation and New Accounting Standards - Narrative (Details) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 18, 2020 USD ($) | Dec. 27, 2020 USD ($) | Sep. 27, 2020 USD ($) | Mar. 29, 2020 USD ($) | Dec. 29, 2019 USD ($) | Sep. 29, 2019 USD ($) | Dec. 27, 2020 USD ($) segment | Dec. 29, 2019 USD ($) | Jun. 28, 2020 USD ($) | Jun. 30, 2019 USD ($)
Basis of Presentation and Changes in Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  | 1 |  |  |
Stockholders' equity |  | $ 1,871,600,000 | $ 1,915,100,000 |  | $ 1,995,000,000.0 | $ 2,025,600,000 | $ 1,871,600,000 | $ 1,995,000,000.0 | $ 2,089,200,000 | $ 2,041,200,000
Duration of single purchase period for ESPP |  |  |  |  |  |  | 6 months |  |  |
Net loss |  | (82,700,000) | (184,100,000) |  | (54,000,000.0) | (37,800,000) | $ (266,800,000) | (91,800,000) |  |
Income tax benefit |  | (200,000) |  |  | (500,000) |  | (1,000,000.0) | (1,800,000) |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Changes in Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  | $ 1,500,000 | (1,500,000) |  |  | (1,500,000) |  |
Income tax benefit |  |  |  | $ (1,500,000) |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Changes in Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  | (1,306,600,000) | (1,223,600,000) |  | (939,600,000) | (885,300,000) | $ (1,306,600,000) | $ (939,600,000) | $ (1,039,200,000) | $ (847,500,000)
Net loss |  | $ (83,000,000.0) | $ (184,400,000) |  | $ (54,300,000) | $ (37,800,000) |  |  |  |
LED Business | Maximum |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Changes in Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business | $ 300,000,000 |  |  |  |  |  |  |  |  |

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