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Income Taxes - Additional Information (Detail)
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Income Tax Disclosure [Abstract]    
Company's effective tax rate 33.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations (277.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations