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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013
Schedule Of Income Taxes [Line Items] |  |
Federal tax net operating losses | $ 6,600,000 |
Federal tax net operating losses expiration year | 2033 |
State tax net operating losses | 102,600,000 |
Foreign losses | 1,500,000 |
Federal income tax credits | 1,400,000 |
State income tax credits | 3,600,000 |
Valuation allowances | 6,215,000 | 6,968,000
Period of uncertain tax positions as non-current income tax liabilities unless expected to be paid | 1 year |
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 | 100,000 |
Stock Options [Member] |  |
Schedule Of Income Taxes [Line Items] |  |
Net operating loss carryforwards | 1,200,000 |
Maximum [Member] |  |
Schedule Of Income Taxes [Line Items] |  |
State tax net operating losses expiration year | 2034 |
Federal income tax credits expiration year | 2034 |
State income tax credits expiration year | 2030 |
Accrued interest | $ 100,000 | $ 100,000
Minimum [Member] |  |
Schedule Of Income Taxes [Line Items] |  |
State tax net operating losses expiration year | 2014 |
Federal income tax credits expiration year | 2024 |
State income tax credits expiration year | 2014 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31928-109318 + Details
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