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Related Party Transactions (Details) - USD ($) |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2023 | Jul. 01, 2022 | Jun. 24, 2022 | Jun. 25, 2021 | Mar. 25, 2022 | Dec. 02, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |
Total net sales |  |  | $ 217,753,000 | $ 188,142,000 |  |
Trade and other accounts receivable due from related party |  |  | 30,109,000 |  | $ 27,360,000 |
Amounts due to related party |  |  | 4,704,000 |  | 5,222,000 |
Director |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Labor and related expense |  |  | $ 51,000 | 48,000 |  |
Sanken |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage by majority shareholder |  |  | 51.50% |  |  |
Sanken | Polar Semiconductor, LLC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage by majority shareholder |  |  | 70.00% |  |  |
Allegro Microsystems, Inc. | Polar Semiconductor, LLC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage by majority shareholder |  |  | 30.00% |  |  |
Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Total net sales |  |  | $ 41,709,000 | 35,453,000 |  |
PSL |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Purchases from related party |  |  | 14,671,000 | 13,380,000 |  |
Amounts due to related party |  |  | 4,704,000 |  | 5,222,000 |
PSL | Initial PSL Loan | Loans Payable |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Principle amount |  |  |  |  |  | $ 7,500,000
Debt instrument, interest rate |  |  |  |  |  | 1.26%
Long-term debt |  |  | 7,031,000 |  |  |
Debt instrument, periodic payment |  |  | 500,000 |  |  |
Interest and other income |  |  | 31,000 |  |  |
PSL | Initial PSL Loan | Loans Payable | Subsequent Event |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Debt instrument, periodic payment |  | $ 491,000 |  |  |  |
Interest and other income |  | $ 22,000 |  |  |  |
PSL | Secondary PSL Loan | Loans Payable | Forecast |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Principle amount | $ 7,500,000 |  |  |  |  |
Debt instrument, term | 4 years |  |  |  |  |
Sanken |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Trade and other accounts receivable due from related party |  |  | 30,081,000 |  | 27,256,000 |
Other accounts receivable from related party |  |  | $ 28,000 |  | $ 104,000 |
Option to terminate, period of notice |  |  | 6 months |  |  |
Rent expense |  |  | $ 48,000 | 56,000 |  |
Sanken | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Total net sales |  |  | 41,709,000 | 35,453,000 |  |
Director |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Severance payment if terminated |  |  |  | 180,000 |  |
Fees paid |  |  | $ 72,000 | $ 56,000 |  |

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