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Schedule of Derivative Instruments (Detail) - USD ($) $ in Thousands | Dec. 26, 2020 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 28, 2019
--- | --- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 33,000
Subsequent Event [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Fair Value, Net | $ 125 | $ 117 | $ 525 | $ 736 | $ 508 |
Subsequent Event [Member] | Mexico, Pesos |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | 132,773 | 141,173 | 138,213 | 146,613 | 152,613 |
Subsequent Event [Member] | United States of America, Dollars |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 6,241 | $ 6,729 | $ 6,257 | $ 6,553 | $ 7,187 |

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