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Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate to the Company's Effective Income Tax Rate (Detail) | 12 Months Ended
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Sep. 26, 2015 | Sep. 27, 2014 | Sep. 28, 2013
Income Tax Disclosure [Abstract] |  |  |
Statutory federal income tax rate | 35.00% | 35.00% | (35.00%)
State income taxes, net of federal benefit | 2.40% | 2.10% | (5.20%)
Other permanent differences | (0.50%) | 0.20% | 2.40%
Adjustment of prior year accruals | (0.50%) | (0.20%) | 1.80%
Uncertain tax positions | 0.00% | 0.40% | 3.70%
Credits | (0.30%) | (1.60%) | (29.30%)
Change in valuation allowances | 0.00% | (5.40%) | (9.00%)
Foreign rate differential | (0.10%) | (1.30%) | (3.60%)
Effective income tax rate (benefit) | 36.00% | 29.20% | (74.20%)

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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