Annual report pursuant to Section 13 and 15(d)

Other Intangible Assets - Additional Information (Detail)

v3.3.1.900
Other Intangible Assets - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 26, 2015
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Jun. 28, 2014
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets, impairment charge $ 7,300,000 $ 7,300,000 $ 0 $ 0  
Fair value of indefinite-lived intangible assets exceeds carrying value 15,000,000 15,000,000      
Amortization expense for intangibles   4,300,000 $ 4,300,000 $ 5,100,000  
Estimated annual amortization expense related to acquired intangible assets, 2016 4,000,000 4,000,000      
Estimated annual amortization expense related to acquired intangible assets, 2017 4,000,000 4,000,000      
Estimated annual amortization expense related to acquired intangible assets, 2018 4,000,000 4,000,000      
Estimated annual amortization expense related to acquired intangible assets, 2019 4,000,000 4,000,000      
Estimated annual amortization expense related to acquired intangible assets, 2020 $ 4,000,000 $ 4,000,000      
Minimum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   1 year      
Maximum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   25 years      
Marketing-Related Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   6 years      
Marketing-Related Intangible Assets [Member] | Envincio, LLC [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets acquired         $ 1,700,000
Customer-Related Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   14 years      
Other Acquired Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Weighted average remaining lives of acquired intangible assets   14 years      
Other Acquired Intangible Assets [Member] | Envincio, LLC [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets acquired         $ 9,800,000