Annual report pursuant to Section 13 and 15(d)

Other Intangible Assets - Additional Information (Detail)

v3.8.0.1
Other Intangible Assets - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Dec. 24, 2016
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets, impairment charge $ 1,800,000 $ 0 $ 1,800,000 $ 7,300,000  
Amortization expense for intangibles   8,800,000 $ 5,800,000 $ 4,300,000  
Estimated annual amortization expense related to acquired intangible assets, 2018   8,000,000      
Estimated annual amortization expense related to acquired intangible assets, 2019   8,000,000      
Estimated annual amortization expense related to acquired intangible assets, 2020   8,000,000      
Estimated annual amortization expense related to acquired intangible assets, 2021   8,000,000      
Estimated annual amortization expense related to acquired intangible assets, 2022   $ 8,000,000      
Minimum          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   3 years      
Maximum          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   25 years      
Marketing-Related Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   4 years      
Customer-Related Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   10 years      
Other Acquired Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   11 years      
Segrest Inc. | Marketing-Related Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Other intangible assets, net         $ 2,000,000
Segrest Inc. | Customer-Related Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Other intangible assets, net         27,300,000
Segrest Inc. | Other Acquired Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Other intangible assets, net         $ 1,300,000