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Acquisitions and Investments in Joint Ventures - Summary of Recording of Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 01, 2015 | Jul. 31, 2015 | Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014 | Apr. 01, 2014 | Sep. 28, 2013
--- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 231,385 | $ 209,089 | $ 208,233 |  | $ 205,756
DMC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets, net of cash and cash equivalents acquired | $ 41,326 |  |  |  |  |  |
Fixed assets | 538 |  |  |  |  |  |
Goodwill | 15,058 |  |  |  |  |  |
Other assets | 20 |  |  |  |  |  |
Intangible assets | 18,700 |  |  |  |  |  |
Current liabilities | (14,626) |  |  |  |  |  |
Net assets acquired, less cash and cash equivalents | 61,016 |  |  |  |  |  |
IMS Trading Corp [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  | $ 20,773 |  |  |  |  |
Fixed assets |  | 1,670 |  |  |  |  |
Goodwill |  | 1,365 | $ 1,400 |  |  |  |
Other assets |  | 0 |  |  |  |  |
Intangible assets |  | 4,510 |  |  |  |  |
Current liabilities |  | (5,100) |  |  |  |  |
Net assets acquired, less cash and cash equivalents |  | 23,218 |  |  |  |  |
Envincio, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  |  |  |  |  | $ 6,650 |
Fixed assets |  |  |  |  |  | 20 |
Goodwill |  |  |  |  |  | 3,333 |
Intangible assets |  |  |  |  |  | 11,450 |
Current liabilities |  |  |  |  |  | (1,170) |
Net assets acquired, less cash and cash equivalents |  |  |  |  |  | $ 20,283 |
Amounts Previously Recognized as of Acquisition Date [Member] | DMC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets, net of cash and cash equivalents acquired | 41,170 |  |  |  |  |  |
Fixed assets | 521 |  |  |  |  |  |
Goodwill | 0 |  |  |  |  |  |
Other assets | 33,810 |  |  |  |  |  |
Intangible assets | 0 |  |  |  |  |  |
Current liabilities | (14,586) |  |  |  |  |  |
Net assets acquired, less cash and cash equivalents | 60,915 |  |  |  |  |  |
Amounts Previously Recognized as of Acquisition Date [Member] | IMS Trading Corp [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  | 20,458 |  |  |  |  |
Fixed assets |  | 1,670 |  |  |  |  |
Goodwill |  | 0 |  |  |  |  |
Other assets |  | 5,356 |  |  |  |  |
Intangible assets |  | 0 |  |  |  |  |
Current liabilities |  | (5,100) |  |  |  |  |
Net assets acquired, less cash and cash equivalents |  | 22,384 |  |  |  |  |
Measurement Period Adjustments [Member] | DMC [Member] |  |  |  |  |  |  |
Measurement Period Adjustments |  |  |  |  |  |  |
Current assets, net of cash and cash equivalents acquired | 156 |  |  |  |  |  |
Fixed assets | 17 |  |  |  |  |  |
Goodwill | 15,058 |  |  |  |  |  |
Other assets | (33,790) |  |  |  |  |  |
Other intangible assets, net | 18,700 |  |  |  |  |  |
Current liabilities | (40) |  |  |  |  |  |
Net assets acquired, less cash and cash equivalents | $ 101 |  |  |  |  |  |
Measurement Period Adjustments [Member] | IMS Trading Corp [Member] |  |  |  |  |  |  |
Measurement Period Adjustments |  |  |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  | 315 |  |  |  |  |
Fixed assets |  | 0 |  |  |  |  |
Goodwill |  | 1,365 |  |  |  |  |
Other assets |  | (5,356) |  |  |  |  |
Other intangible assets, net |  | 4,510 |  |  |  |  |
Current liabilities |  | 0 |  |  |  |  |
Net assets acquired, less cash and cash equivalents |  | $ 834 |  |  |  |  |

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