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Income Taxes - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
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Jun. 27, 2015 | Jun. 28, 2014 | Jun. 27, 2015 | Jun. 28, 2014
Income Tax Disclosure [Abstract] |  |  |  |
Company's effective tax rate | 37.10% | 50.00% | 29.80% | 214.20%

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