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Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Shipping and handling costs included in net sales | $ 3.8 | $ 5.4 | $ 8.0
Cost of shipping and handling included in selling, general and administrative expenses | 48.9 | 44.4 | 45.6
Advertising expenses | 30.0 | 25.0 | 30.9
Employees benefit plan | 1.7 | 1.9 | 1.9
Valuation allowances related to net deferred tax assets | 6.6 | 6.2 |
Undistributed foreign earnings | 3.0 |  |
Deferred tax liabilities, net of foreign tax credits | $ 0.5 |  |
Maturity period of debt instruments | 3 months |  |
Other long-lived asset impairments | $ 1.8 | $ 7.3 |
Capitalized costs write off |  |  | $ 5.9
Building [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Useful life | 30 years |  |
Minimum [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Maturity date of investments | 3 months |  |
Minimum [Member] | Equipment and Capitalized Software [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Useful life | 3 years |  |
Maximum [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Maturity date of investments | 1 year |  |
Maximum [Member] | Equipment and Capitalized Software [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Useful life | 10 years |  |
Class A Common Stock [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
401(k) matching contributions made in Class A common stock | 99 | 195 | 245
Subsidiaries [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Noncontrolling interest owned by the subsidiary | 20.00% |  |

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