| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 212.14a | 351.58a |
| Restricted cash | 10.02a | 7.13a |
| Trade accounts receivable, net of provision for expected credit losses of $145 and $102 at March 29, 2024 and March 31, 2023, respectively | 118.51a | 111.29a |
| Trade and other accounts receivable due from related party | 0.21a | 13.49a |
| Accounts receivable - other | 2.7a | 1.94a |
| Inventories | 162.3a | 151.3a |
| Prepaid income taxes | 31.91a | 2.09a |
| Prepaid expenses and other current assets | 30.67a | 23.26a |
| Current portion of related party notes receivable | 3.75a | 3.75a |
| Total current assets | 572.21a | 665.83a |
| Property, plant and equipment, net | 321.18a | 263.1a |
| Operating lease right-of-use assets, net | 20.37a | 16.87a |
| Deferred income tax assets | 54.5a | 50.36a |
| Goodwill | 202.43a | 27.69a |
| Intangible assets, net | 276.85a | 52.38a |
| Related party notes receivable, less current portion | 4.69a | 8.44a |
| Equity investment in related party | 26.73a | 27.27a |
| Other assets | 51.65a | 69.23a |
| Total assets | 1,530.6a | 1,181.16a |
| Liabilities, non-controlling interests and stockholders’ equity | — | — |
| Current liabilities | — | — |
| Trade accounts payable | 35.96a | 56.26a |
| Amounts due to related party | 1.63a | 9.68a |
| Accrued expenses and other current liabilities | 71.13a | 94.89a |
| Current portion of operating lease liabilities | 5.26a | 4.49a |
| Current portion of long-term debt | 3.93a | 0a |
| Total current liabilities | 117.91a | 165.33a |
| Long-term debt | 249.61a | 25a |
| Operating lease liabilities, less current portion | 16.4a | 13.05a |
| Other long-term liabilities | 14.96a | 10.97a |
| Total liabilities | 398.89a | 214.34a |
| Stockholders’ equity | — | — |
| Preferred stock, $0.01 par value; 20,000,000 shares authorized, no shares issued or outstanding at March 29, 2024 and March 31, 2023 | 0a | 0a |
| Common stock, $0.01 par value; 1,000,000,000 shares authorized, 193,164,609 shares issued and outstanding at March 29, 2024; 1,000,000,000 shares authorized, 191,754,292 issued and outstanding at March 31, 2023 | 1.93a | 1.92a |
| Additional paid-in capital | 694.33a | 674.18a |
| Retained earnings | 463.01a | 310.32a |
| Accumulated other comprehensive loss | -28.84a | -20.78a |
| Equity attributable to Allegro MicroSystems, Inc. | 1,130.44a | 965.63a |
| Non-controlling interests | 1.28a | 1.19a |
| Total stockholders’ equity | 1,131.72a | 966.82a |
| Total liabilities, non-controlling interests and stockholders’ equity | 1,530.6a | 1,181.16a |