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Income Taxes - Additional Information (Detail) - USD ($) | Sep. 24, 2016 | Sep. 26, 2015
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Schedule Of Income Taxes [Line Items] |  |
State tax net operating losses | $ 101,800,000 |
Foreign losses | 400,000 |
State income tax credits | 3,600,000 |
Valuation allowances | 6,583,000 | $ 6,205,000
Penalties were accrued related to uncertain tax positions | 0 | 0
Unrecognized tax benefit may be recognized within twelve months as a result of a settlement | 200,000 |
Maximum [Member] |  |
Schedule Of Income Taxes [Line Items] |  |
Accrued interest | $ 100,000 | $ 100,000

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