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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 | Sep. 26, 2015 | Sep. 27, 2014 | Apr. 01, 2014 | Sep. 28, 2013 | Sep. 29, 2012
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 209,089 | $ 208,233 |  | $ 205,756 | $ 210,223
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 |  |
As Previously Reported [Member] | Envincio, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  |  | 6,650 |  |
Fixed assets |  |  | 20 |  |
Goodwill |  |  | 2,477 |  |
Intangible assets |  |  | 12,306 |  |
Current liabilities |  |  | (1,170) |  |
Net assets acquired, less cash and cash equivalents |  |  | 20,283 |  |
Adjustments [Member] | Envincio, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  |  | 0 |  |
Fixed assets |  |  | 0 |  |
Goodwill |  |  | 856 |  |
Intangible assets |  |  | (856) |  |
Current liabilities |  |  | 0 |  |
Net assets acquired, less cash and cash equivalents |  |  | $ 0 |  |

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