Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 30, 2011
Finite Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	$ 4,332,000	$ 4,879,000	$ 2,948,000
Future amortization expense, remaining fiscal year 2014	5,300,000
Future amortization expense, fiscal year 2015	6,000,000
Future amortization expense, fiscal year 2016	2,400,000
Future amortization expense, fiscal year 2017	1,800,000
Future amortization expense, fiscal year 2018	1,800,000
Future amortization expense, fiscal year 2018 and thereafter	$ 6,100,000