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Transactions with Related Parties - Additional Information (Detail) - Contract Packaging, Inc. [Member] - USD ($) $ in Millions | 12 Months Ended
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Sep. 26, 2015 | Sep. 27, 2014 | Sep. 28, 2013
Related Party Transaction [Line Items] |  |  |
Percentage of shares held by CPI in Tech Pac | 20.00% | 20.00% | 20.00%
Amount due to related party | $ 0.6 | $ 0.6 |
Tech Pac [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases products from related party | $ 35.2 | $ 30.8 | $ 32.5

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