| Line Item | Mar 29, 2026 | Dec 28, 2025 | Sep 29, 2025 | Sep 28, 2025 | Jun 29, 2025 | Mar 30, 2025 | Dec 29, 2024 | Sep 29, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 24, 2023 | Jun 25, 2023 | Mar 26, 2023 | Dec 25, 2022 | Sep 25, 2022 | Jun 26, 2022 | Mar 27, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue, net | ||||||||||||||||||
| YoY growth | -23.8% | -9.1% | +9.0% | +1.1% | -1.8% | -7.6% | ||||||||||||
| Cost of revenue, net | ||||||||||||||||||
| Gross (loss) income | ||||||||||||||||||
| % of revenue | -26.6% | -46.5% | -39.2% | -39.2% | -13.0% | -12.1% | ||||||||||||
| Operating expenses: | ||||||||||||||||||
| Research and development | ||||||||||||||||||
| Sales, general and administrative | ||||||||||||||||||
| Factory start-up costs | ||||||||||||||||||
| Gain on disposal of property and equipment | ||||||||||||||||||
| Goodwill impairment | — | — | — | — | — | — | ||||||||||||
| Restructuring and other expenses | ||||||||||||||||||
| Operating loss | ||||||||||||||||||
| % of revenue | -76.1% | -94.0% | -82.0% | -82.0% | -295.2% | -104.9% | ||||||||||||
| Reorganization items, net | ||||||||||||||||||
| Interest expense, net of capitalized interest | ||||||||||||||||||
| Non-operating income, net | ||||||||||||||||||
| (Loss) income before income taxes | ||||||||||||||||||
| Income tax expense (benefit) | ||||||||||||||||||
| Net (loss) income from continuing operations | — | — | — | — | — | — | ||||||||||||
| Net loss from discontinued operations | — | — | — | — | — | — | ||||||||||||
| Net (loss) income | ||||||||||||||||||
| % of revenue | -79.8% | -89.4% | 213.5% | -327.0% | -339.7% | -154.0% | ||||||||||||
| Net (loss) income - basic (USD per share) | ||||||||||||||||||
| Net (loss) income - diluted (USD per share) |