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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