Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Sep. 26, 2015
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, impairment charge			$ 7.3
Fair value of indefinite-lived intangible assets exceeds carrying value			$ 15.0
Amortization expense for intangibles	$ 1.0	$ 0.9
Estimated annual amortization expense related to acquired intangible assets, 2016	4.0
Estimated annual amortization expense related to acquired intangible assets, 2017	4.0
Estimated annual amortization expense related to acquired intangible assets, 2018	4.0
Estimated annual amortization expense related to acquired intangible assets, 2019	4.0
Estimated annual amortization expense related to acquired intangible assets, 2020	$ 4.0
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
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