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Fair Value Measurements - Schedule of Estimated Fair Value of Assets Measured on a Nonrecurring Basis (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 29, 2014 | Dec. 28, 2013 | Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Intangible asset, Total Losses | $ (27.1) |  |  |  |
Total Losses |  | $ (3.1) |  |  |
Cost-method equity investments, Total Losses |  |  | $ (1.1) | $ (7.8) | $ (6.9)
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | 36.2
Intangible asset, Total Losses |  |  |  |  | (32.2)
Cost-method equity investments |  |  |  |  | 0.8
Cost-method equity investments, Total Losses |  |  |  |  | (6.9)
Total Losses |  |  |  |  | (43.7)
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | 0.0
Cost-method equity investments |  |  |  |  | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | 0.0
Cost-method equity investments |  |  |  |  | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | 36.2
Cost-method equity investments |  |  |  |  | 0.8
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value |  |  |  |  | 1.0
Total Losses |  |  |  |  | (1.5)
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value |  |  |  |  | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value |  |  |  |  | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value |  |  |  |  | 1.0
Fair Value, Measurements, Nonrecurring [Member] | Buildings [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value |  |  |  |  | 1.4
Total Losses |  |  |  |  | (3.1)
Fair Value, Measurements, Nonrecurring [Member] | Buildings [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value |  |  |  |  | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Buildings [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value |  |  |  |  | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Buildings [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value |  |  |  |  | $ 1.4

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- Definition Fair value portion of investments accounted under the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592 + Details
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- Definition Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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