Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data - Unaudited - Schedule of Quarterly Financial Data - Unaudited (Parenthetical) (Detail)

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Quarterly Financial Data - Unaudited - Schedule of Quarterly Financial Data - Unaudited (Parenthetical) (Detail) (USD $)
3 Months Ended 12 Months Ended
Sep. 27, 2014
Jun. 28, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Sep. 29, 2012
Quarterly Financial Information Disclosure [Abstract]            
Gain on sale of manufacturing plant assets $ 2,900,000 $ 2,000,000        
Goodwill impairment     7,709,000 0 7,709,000 0
Charge related to new products     $ 11,200,000 $ 16,900,000 $ 11,200,000