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Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Shipping and handling costs included in net sales | $ 9.4 | $ 3.8 | $ 5.4
Cost of shipping and handling included in selling, general and administrative expenses | 59.3 | 48.9 | 44.4
Advertising expenses | 34.5 | 30.0 | 25.0
Employees benefit plan | 2.4 | 1.7 | 1.9
Valuation allowances related to net deferred tax assets | 6.5 | 6.6 |
Undistributed foreign earnings | 2.0 |  |
Deferred tax liabilities, net of foreign tax credits | $ 0.3 |  |
Maturity period of debt instruments | 3 months |  |
Other long-lived asset impairments |  | $ 1.8 |
Capitalized costs write off |  |  | $ 7.3
Building |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Useful life | 30 years |  |
Minimum | Equipment and Capitalized Software |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Useful life | 3 years |  |
Maximum | Equipment and Capitalized Software |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Useful life | 10 years |  |
Class A common stock |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
401(k) matching contributions made in Class A common stock | 81,000 | 99,000 | 195,000
Subsidiaries |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Noncontrolling interest owned by the subsidiary | 20.00% |  |

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