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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Dec. 26, 2021
Dec. 27, 2020
Sep. 27, 2020
Dec. 26, 2021
Dec. 27, 2020
Dec. 26, 2021
Operating activities:            
Net loss $ (96.7) $ (82.7) $ (184.1) $ (166.8) $ (266.8)  
Net loss from discontinued operations 0.0 (28.4)   0.0 (137.2)  
Net loss from continuing operations (96.7) (54.3)   (166.8) (129.6)  
Adjustments to reconcile net loss from continuing operations to cash used in operating activities:            
Depreciation and amortization       67.5 56.2  
Amortization of debt issuance costs and discount, net of non-cash capitalized interest       9.0 18.1  
Stock-based compensation       30.0 27.4  
Loss on extinguishment of debt 24.8 0.0   24.8 0.0  
Loss on disposal or impairment of long-lived assets       1.6 1.5  
Amortization of premium/discount on investments       3.2 3.2  
Realized gain on sale of investments (0.1) (0.2)   (0.3) (0.2)  
Gain on equity investment       0.0 (7.0)  
Foreign exchange gain on equity investment       0.0 (3.2)  
Deferred income taxes       0.4 2.3  
Changes in operating assets and liabilities:            
Accounts receivable, net       (14.1) (9.5)  
Inventories       (41.0) (21.1)  
Prepaid expenses and other assets       (5.7) (1.8)  
Accounts payable, trade       2.8 9.9  
Accrued salaries and wages and other liabilities       (13.3) 17.9  
Accrued contract liabilities       6.9 3.8  
Net cash used in operating activities of continuing operations       (95.0) (32.1)  
Net cash provided by operating activities of discontinued operations       0.0 6.2  
Cash used in operating activities       (95.0) (25.9)  
Investing activities:            
Purchases of property and equipment       (401.6) (257.5)  
Purchases of patent and licensing rights       (2.6) (1.9)  
Proceeds from sale of property and equipment, including insurance proceeds       2.7 0.1  
Purchases of short-term investments       (29.8) (85.8)  
Proceeds from maturities of short-term investments       107.8 268.5  
Proceeds from sale of short-term investments       189.2 24.1  
Reimbursement of property and equipment purchases from long-term incentive agreement       50.8 0.0 $ 61.5
Net cash used in investing activities of continuing operations       (83.5) (52.5)  
Net cash provided by investing activities of discontinued operations       0.0 2.7  
Cash used in investing activities       (83.5) (49.8)  
Financing activities:            
Proceeds from long-term debt borrowings       20.0 0.0  
Payments on long-term debt borrowings, including finance lease obligations       (20.2) (0.2)  
Proceeds from issuance of common stock       11.5 39.2  
Tax withholding on vested equity awards       (25.3) (24.0)  
Commitment fee on long-term incentive agreement       (1.0) (0.5)  
Cash (used in) provided by financing activities       (15.0) 14.5  
Effects of foreign exchange changes on cash and cash equivalents       (0.1) 0.5  
Net change in cash and cash equivalents       (193.6) (60.7)  
Cash and cash equivalents, beginning of period     $ 448.8 379.0 448.8  
Cash and cash equivalents, end of period $ 185.4 $ 388.1   $ 185.4 $ 388.1 $ 185.4