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Income Taxes - Additional Information (Detail)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Mar. 28, 2015
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Mar. 29, 2014
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Mar. 28, 2015
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Mar. 29, 2014
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| Income Tax Disclosure [Abstract] | ||||
| Company's effective tax rate | 21.40% | 42.70% | 26.60% | 67.90% |