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Acquisitions and Investments in Joint Ventures - Additional Information (Detail) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 30, 2014 USD ($) JointVenture | Sep. 24, 2016 USD ($) JointVenture | Sep. 24, 2016 USD ($) JointVenture | Sep. 26, 2015 USD ($) | Jul. 31, 2015 USD ($) | Sep. 27, 2014 USD ($) | Apr. 01, 2014 USD ($) | Sep. 28, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Excess of purchase price included in goodwill |  |  |  | $ 231,385 | $ 231,385 | $ 209,089 |  | $ 208,233 |  | $ 205,756
Percentage of equity interest in joint venture |  |  |  | 50.00% | 50.00% |  |  |  |  |
Number of joint ventures | JointVenture |  |  |  | 2 | 2 |  |  |  |  |
Purishield LLC and Ceregenin LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in joint ventures |  |  | $ 16,000 |  |  |  |  |  |  |
Percentage of equity interest in joint venture |  |  | 50.00% |  |  |  |  |  |  |
Number of joint ventures | JointVenture |  |  | 2 |  |  |  |  |  |  |
Hydro Organics Wholesale Inc [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  | $ 7,800 |  |  |  |  |  |  |  |
Purchase price in excess of fair value |  | 10,700 |  |  |  |  |  |  |  |
Excess of purchase price included in intangible assets |  | 5,200 |  |  |  |  |  |  |  |
Excess of purchase price included in goodwill |  | 5,500 |  |  |  |  |  |  |  |
Hydro Organics Wholesale Inc [Member] | Future Performance [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated contingent future performance-based payments |  | $ 2,600 |  |  |  |  |  |  |  |
DMC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price in excess of fair value | $ 33,800 |  |  |  |  |  |  |  |  |
Excess of purchase price included in intangible assets | 18,700 |  |  |  |  |  |  |  |  |
Excess of purchase price included in goodwill | 15,058 |  |  |  |  |  |  |  |  |
Cost of acquisition | $ 61,000 |  |  |  |  |  |  |  |  |
DMC and IMS Trading Corp [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Impact of acquisitions on the Company's operating income |  |  |  |  | $ 10,600 |  |  |  |  |
IMS Trading Corp [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Excess of purchase price included in intangible assets |  |  |  |  |  |  | $ 4,510 |  |  |
Excess of purchase price included in goodwill |  |  |  | $ 1,400 | $ 1,400 |  | 1,365 |  |  |
Purchase of certain assets |  |  |  |  |  |  | $ 23,200 |  |  |
Envincio, LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Excess of purchase price included in intangible assets |  |  |  |  |  |  |  |  | $ 11,450 |
Excess of purchase price included in goodwill |  |  |  |  |  |  |  |  | 3,333 |
Purchase of certain assets |  |  |  |  |  |  |  |  | $ 20,300 |
Other Nonoperating Income (Expense) [Member] | Purishield LLC and Ceregenin LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Non-cash impairment charge |  |  |  | $ 16,600 |  |  |  |  |  |

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