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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