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Business Segment Data - Financial Information Relating to Company's Business Segments (Parenthetical) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012
Segment Reporting [Abstract] |  |  |  |
Goodwill impairment | $ 7,709,000 | $ 0 | $ 7,709,000 | $ 0
Charge related to new products | 11,200,000 | 16,900,000 | 11,200,000 |
Gain from sale of manufacturing plant assets |  | $ 4,900,000 |  |

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