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Organization and Significant Accounting Policies - Additional Information 1 (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 24, 2016 USD ($) Companies | Sep. 24, 2016 USD ($) Companies | Sep. 26, 2015 USD ($) | Sep. 27, 2014 USD ($) | Dec. 30, 2014
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Owned percentage in unconsolidated entities (as percent) | 50.00% | 50.00% |  |  |
Number of unconsolidated companies | Companies | 4 | 4 |  |  |
Equity income |  | $ 400,000 | $ 400,000 | $ 600,000 |
Investment in unconsolidated companies | $ 500,000 | 500,000 | 16,500,000 |  |
Non-cash impairment charge | 16,600,000 | 19,367,000 | 7,272,000 | 5,870,000 |
Excess loss insurance that covers any health care claims |  | 700,000 |  |  |
Outstanding derivative instruments | $ 0 | 0 | 0 |  |
Stock-based compensation |  | 8,356,000 | 8,315,000 | 7,678,000 |
Stock-based compensation after tax |  | 5,300,000 | $ 5,300,000 | $ 4,900,000 |
Minimum [Member] |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
General liability and vehicle liability insurance policies |  | 250,000 |  |  |
Maximum [Member] |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
General liability and vehicle liability insurance policies |  | 350,000 |  |  |
Purishield LLC and Ceregenin LLC [Member] |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Owned percentage in unconsolidated entities (as percent) |  |  |  |  | 50.00%
Non-cash impairment charge |  | $ 16,600,000 |  |  |

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