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. 26, 2015
Sep. 27, 2014
Jun. 28, 2014
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Quarterly Financial Information Disclosure [Abstract]            
Non-cash impairment charge to indefinite-lived intangible assets $ 7,300,000     $ 7,300,000 $ 0 $ 0
Charge related to new products         $ 16,900,000 $ 11,200,000
Gain on sale of manufacturing plant assets   $ 2,900,000 $ 2,000,000