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Acquisitions and Investments in Joint Ventures - Additional Information (Detail) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 28, 2017 USD ($) | Oct. 24, 2016 USD ($) | Oct. 21, 2016 USD ($) | Dec. 01, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jul. 31, 2015 USD ($) | Dec. 30, 2014 USD ($) JointVenture | Sep. 24, 2016 USD ($) JointVenture | Sep. 30, 2017 USD ($) JointVenture | Sep. 24, 2016 USD ($) JointVenture | Sep. 26, 2015 USD ($) | Jun. 24, 2017 USD ($) | Sep. 27, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in business |  |  |  |  |  |  |  |  | $ 12,495 | $ 0 | $ 0 |  |
Excess of purchase price included in goodwill |  |  |  |  |  |  |  | $ 231,385 | $ 256,275 | $ 231,385 | $ 209,089 |  | $ 208,233
Number of joint ventures | JointVenture |  |  |  |  |  |  |  | 2 | 2 | 2 |  |  |
Mature, seasonal business |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent interest in ventures |  |  |  |  |  |  |  |  | 45.00% |  |  |  |
Start-up company |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent interest in ventures |  |  |  |  |  |  |  |  | 30.00% |  |  |  |
Purishield LLC and Ceregenin LLC |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
K&H Manufacturing |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquisition | $ 48,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price in excess of fair value |  |  |  |  |  |  |  |  |  |  |  | $ 41,800 |
Segrest Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price in excess of fair value |  |  |  |  |  |  |  |  | $ 44,400 |  |  |  |
Cost of acquisition |  | $ 60,000 | $ 56,743 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ 6,000 | 2,700 |  |  |  |  |  |  |  |  |  |
Other intangible assets |  |  | 27,650 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 25,890 |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  | 54,043 |  |  |  |  |  |  |  |  |  |
Excess of purchase price included in intangible assets |  |  | 27,650 |  |  |  |  |  |  |  |  |  |
Excess of purchase price included in goodwill |  |  | $ 25,890 |  |  |  |  |  |  |  |  |  |
Hydro Organics Wholesale Inc |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price in excess of fair value |  |  |  |  | $ 10,700 |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  | 7,800 |  |  |  |  |  |  |  |
Excess of purchase price included in intangible assets |  |  |  |  | 5,200 |  |  |  |  |  |  |  |
Excess of purchase price included in goodwill |  |  |  |  |  |  |  | $ 5,500 |  | $ 5,500 |  |  |
Hydro Organics Wholesale Inc | Future Performance |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | 2,600 |  |  |  |  |  |  |  |
Contingent consideration cap |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
DMC |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price in excess of fair value |  |  |  | $ 33,800 |  |  |  |  |  |  |  |  |
Cost of acquisition |  |  |  | 61,000 |  |  |  |  |  |  |  |  |
Other intangible assets |  |  |  | 18,700 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 15,058 |  |  |  |  |  |  |  |  |
Excess of purchase price included in intangible assets |  |  |  | 18,700 |  |  |  |  |  |  |  |  |
Excess of purchase price included in goodwill |  |  |  | $ 15,058 |  |  |  | 15,100 |  | 15,100 |  |  |
DMC and IMS Trading Corp |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of acquisitions on the Company's operating income |  |  |  |  |  |  |  |  |  | 10,600 |  |  |
IMS Trading Corp |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets |  |  |  |  |  | $ 4,510 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 1,365 |  |  |  |  |  |  |
Excess of purchase price included in intangible assets |  |  |  |  |  | 4,510 |  |  |  |  |  |  |
Excess of purchase price included in goodwill |  |  |  |  |  | 1,365 |  | 1,400 |  | 1,400 |  |  |
Purchase of certain assets |  |  |  |  |  | $ 23,200 |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charge |  |  |  |  |  |  |  | $ 16,600 |  |  |  |  |
Other income (expense) | Purishield LLC and Ceregenin LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charge |  |  |  |  |  |  |  |  |  | $ 16,600 |  |  |

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