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Basis of Presentation and New Accounting Standards - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended						6 Months Ended	9 Months Ended
	Mar. 27, 2022 USD ($) $ / shares	Dec. 26, 2021 USD ($)	Sep. 26, 2021 USD ($)	Mar. 28, 2021 USD ($) $ / shares	Dec. 27, 2020 USD ($)	Sep. 27, 2020 USD ($)	Dec. 26, 2021	Mar. 27, 2022 USD ($) segment $ / shares	Mar. 28, 2021 USD ($) $ / shares
Basis of Presentation and Changes in Significant Accounting Policies [Line Items]
Number of reportable segments | segment								1
Gross profit	$ 64.0			$ 44.0				$ 170.4	$ 120.8
Loss before income taxes	(66.1)			(69.5)				(224.6)	(200.1)
Net loss	$ (66.5)	$ (96.7)	$ (70.1)	$ (108.1)	$ (82.7)	$ (184.1)		$ (233.3)	$ (374.9)
Net loss attributable to controlling interest, basic (USD per share) | $ / shares	$ (0.54)			$ (0.96)				$ (1.96)	$ (3.35)
Net loss attributable to controlling interest, diluted (USD per share) | $ / shares	$ (0.54)			$ (0.96)				$ (1.96)	$ (3.35)
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	$ (8.3)							$ (25.2)
Change in deprecation expense effect on earnings	14.8
Gross profit	7.3							12.2
Loss before income taxes	8.2							14.8
Net loss	$ 8.2							$ 14.8
Net loss attributable to controlling interest, basic (USD per share) | $ / shares	$ 0.07							$ 0.12
Net loss attributable to controlling interest, diluted (USD per share) | $ / shares	$ 0.07							$ 0.12
Service Life | Inventories
Basis of Presentation and Changes in Significant Accounting Policies [Line Items]
Inventory adjustments	$ (10.4)							$ (10.4)

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