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Organization and Significant Accounting Policies - Additional Information 1 (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 24, 2016 USD ($) | Sep. 30, 2017 USD ($) Companies | Sep. 24, 2016 USD ($) | Sep. 26, 2015 USD ($) | Dec. 30, 2014
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Number of unconsolidated companies | Companies |  | 6 |  |  |
Equity income (loss) |  | $ (900,000) | $ 400,000 | $ 400,000 |
Investment in unconsolidated companies | $ 500,000 | 9,200,000 | 500,000 |  |
Excess loss insurance that covers any health care claims |  | 700,000 |  |  |
Stock-based compensation |  | 11,115,000 | 8,356,000 | 8,315,000 |
Stock-based compensation after tax |  | 7,000,000 | 5,300,000 | $ 5,300,000 |
Current deferred tax assets reclassified as non-current | 31,500,000 |  | 31,500,000 |  |
Restricted cash | 10,910,000 | $ 12,645,000 | 10,910,000 |  |
Minimum |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Owned percentage in unconsolidated entities (as percent) |  | 30.00% |  |  |
General liability and vehicle liability insurance policies |  | $ 250,000 |  |  |
Maximum |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Owned percentage in unconsolidated entities (as percent) |  | 50.00% |  |  |
General liability and vehicle liability insurance policies |  | $ 350,000 |  |  |
Purishield LLC and Ceregenin LLC |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Owned percentage in unconsolidated entities (as percent) |  |  |  |  | 50.00%
Other income (expense) |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Non-cash impairment charge | $ 16,600,000 |  |  |  |
Other income (expense) | Purishield LLC and Ceregenin LLC |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Non-cash impairment charge |  |  | $ 16,600,000 |  |

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