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Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 27, 2014 | Sep. 26, 2015 | Sep. 27, 2014 | Sep. 28, 2013
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Shipping and handling costs included in net sales |  | $ 5.4 | $ 8.0 | $ 6.9
Cost of shipping and handling included in selling, general and administrative expenses |  | 44.4 | 45.6 | 47.7
Advertising expenses |  | 25.0 | 30.9 | 44.5
Employees benefit plan |  | 1.9 | 1.9 | $ 2.1
Valuation allowances related to net deferred tax assets | $ 6.2 | 6.2 | $ 6.2 |
Undistributed foreign earnings |  | 2.3 |  |
Deferred tax liabilities, net of foreign tax credits |  | 0.4 |  |
capitalized costs write off | $ 5.9 |  |  |
Other long-lived asset impairments |  | 7.3 |  |
Fair value of indefinite-lived intangible assets exceeded carrying value |  | $ 15.0 |  |
Building [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Useful life |  | 30 years |  |
Maximum [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Maturity period of debt instruments |  | 3 months |  |
Maturity date of investments |  | 1 year |  |
Maximum [Member] | Equipment and Capitalized Software [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Useful life |  | 10 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 |  |
Subsidiaries [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Noncontrolling interest owned by the subsidiary |  | 20.00% |  |
Class A Common Stock [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
401(k) matching contributions made in Class A common stock |  | 195,000 | 245,000 | 229,000

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