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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 21 Months Ended
Dec. 25, 2022
Sep. 25, 2022
Dec. 26, 2021
Sep. 26, 2021
Dec. 25, 2022
Dec. 26, 2021
Dec. 25, 2022
Operating activities:              
Net loss $ (90.9) $ (26.2) $ (96.7) $ (70.1) $ (117.1) $ (166.8)  
Adjustments to reconcile net loss to cash used in operating activities:              
Depreciation and amortization         77.1 67.5  
Amortization of debt issuance costs and discount, net of non-cash capitalized interest         2.9 9.0  
Loss on extinguishment of debt 0.0   24.8   0.0 24.8  
Stock-based compensation         43.2 30.0  
Loss on disposal or impairment of long-lived assets, including loss on disposal portion of factory optimization and start-up costs         2.0 1.6  
Amortization of premium/discount on investments         2.2 3.2  
Realized gain on sale of investments 0.0   (0.1)   0.0 (0.3)  
Deferred income taxes         0.3 0.4  
Changes in operating assets and liabilities:              
Accounts receivable, net         (19.1) (14.1)  
Inventories         (38.2) (41.0)  
Prepaid expenses and other assets         (1.8) (5.7)  
Accounts payable, trade         4.2 2.8  
Accrued salaries and wages and other liabilities         (33.2) (13.3)  
Accrued contract liabilities         (2.2) 6.9  
Cash used in operating activities         (79.7) (95.0)  
Investing activities:              
Purchases of property and equipment         (237.8) (401.6)  
Purchases of patent and licensing rights         (2.9) (2.6)  
Proceeds from sale of property and equipment, including insurance proceeds         1.7 2.7  
Purchases of short-term investments         (814.1) (29.8)  
Proceeds from maturities of short-term investments         115.5 107.8  
Proceeds from sale of short-term investments         43.1 189.2  
Reimbursement of property and equipment purchases from long-term incentive agreement         70.7 50.8 $ 220.4
Proceeds from sale of business resulting from the receipt of transaction related note receivable         101.8 0.0  
Cash used in investing activities         (722.0) (83.5)  
Financing activities:              
Proceeds from long-term debt borrowings         0.0 20.0  
Payments on long-term debt borrowings, including finance lease obligations         (0.3) (20.2)  
Proceeds from issuance of common stock         11.2 11.5  
Tax withholding on vested equity awards         (17.3) (25.3)  
Proceeds from convertible notes         1,750.0 0.0  
Payments of debt issuance costs         (31.4) 0.0  
Cash paid for capped call transactions         (273.9) 0.0  
Commitment fees on long-term incentive agreement         (1.0) (1.0)  
Cash provided by (used in) financing activities         1,437.3 (15.0)  
Effects of foreign exchange changes on cash and cash equivalents         0.0 (0.1)  
Net change in cash and cash equivalents         635.6 (193.6)  
Cash and cash equivalents, beginning of period   $ 449.5   $ 379.0 449.5 379.0  
Cash and cash equivalents, end of period $ 1,085.1   $ 185.4   $ 1,085.1 $ 185.4 $ 1,085.1