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Basis of Presentation and New Accounting Standards - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Dec. 26, 2021
USD ($)
$ / shares
Sep. 26, 2021
Dec. 27, 2020
USD ($)
$ / shares
Sep. 27, 2020
USD ($)
Dec. 26, 2021
USD ($)
segment
$ / shares
Dec. 27, 2020
USD ($)
$ / shares
Basis of Presentation and Changes in Significant Accounting Policies [Line Items]            
Number of reportable segments | segment         1  
Gross profit $ 57.0   $ 41.3   $ 106.4 $ 76.8
Loss before income taxes (88.7)   (54.5)   (158.5) (130.6)
Net loss $ (96.7)   $ (82.7) $ (184.1) $ (166.8) $ (266.8)
Net loss attributable to controlling interest, basic (USD per share) | $ / shares $ (0.82)   $ (0.75)   $ (1.42) $ (2.42)
Net loss attributable to controlling interest, diluted (USD per share) | $ / shares $ (0.82)   $ (0.75)   $ (1.42) $ (2.42)
Service Life            
Basis of Presentation and Changes in Significant Accounting Policies [Line Items]            
Useful life (in years)   2 years     5 years  
Decrease in depreciation expense $ (8.5)       $ (16.9)  
Change in deprecation expense effect on earnings 6.6          
Gross profit 4.4       4.9  
Loss before income taxes 5.3       6.6  
Net loss $ 5.3       $ 6.6  
Net loss attributable to controlling interest, basic (USD per share) | $ / shares $ 0.05       $ 0.06  
Net loss attributable to controlling interest, diluted (USD per share) | $ / shares $ 0.05       $ 0.06  
Inventories | Service Life            
Basis of Presentation and Changes in Significant Accounting Policies [Line Items]            
Inventory adjustments $ (10.3)       $ (10.3)