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Acquisitions and Investments in Joint Ventures - Additional Information (Detail) $ in Thousands |  | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2014 USD ($) JointVenture | Dec. 31, 2012 USD ($) | Sep. 26, 2015 USD ($) | Jul. 31, 2015 USD ($) | Sep. 27, 2014 USD ($) | Apr. 01, 2014 USD ($) | Sep. 28, 2013 USD ($) | Sep. 29, 2012 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Investment in joint ventures | $ 16,000 |  |  |  |  |  |  |
Number of joint ventures | JointVenture | 2 |  |  |  |  |  |  |
Percentage of equity interest in joint venture |  |  | 50.00% |  |  |  |  |
Excess of purchase price included in deferred taxes and other assets |  |  | $ 49,731 |  | $ 48,488 |  |  |
Excess of purchase price included in goodwill |  |  | 209,089 |  | $ 208,233 |  | $ 205,756 | $ 210,223
Two newly formed entities [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest in joint venture | 50.00% |  |  |  |  |  |  |
Envincio, LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase of certain assets |  |  |  |  |  | $ 20,300 |  |
Excess of purchase price included in goodwill |  |  |  |  |  | $ 3,333 |  |
FourStar Microbial [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Assets acquired during the period |  | $ 4,800 |  |  |  |  |  |
Contingent future performance-based payments |  | 4,200 |  |  |  |  |  |
Excess of purchase price recorded as goodwill |  | $ 3,200 |  |  |  |  |  |
IMS Trading Corp [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase of certain assets |  |  |  | $ 23,000 |  |  |  |
Excess of purchase price included in deferred taxes and other assets |  |  | $ 4,900 |  |  |  |  |

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