Earnings Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Mar. 27, 2015	Mar. 28, 2014	Mar. 27, 2015	Mar. 28, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding-basic	22,050,000	21,302,000	21,910,000	21,207,000
Weighted average shares outstanding-diluted	22,395,000	21,458,000	22,317,000	21,424,000
Dilutive effect of nonvested stock awards	345,000	156,000	407,000	217,000
Securities with antidilutive effect excluded from the computation of earnings per share	595,000	678,000	555,000	815,000