Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended					12 Months Ended			12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011	Sep. 28, 2013 Marketing-related intangible assets [Member]	Dec. 29, 2012 Marketing-related intangible assets [Member] FourStar Microbial [Member]	Sep. 28, 2013 Customer-related intangible assets [Member]	Sep. 28, 2013 Other acquired intangible assets [Member]	Dec. 29, 2012 Other acquired intangible assets [Member] FourStar Microbial [Member]	Sep. 28, 2013 Minimum [Member]	Sep. 28, 2013 Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired					$ 100,000			$ 7,000,000
Indefinite-lived intangibles assets, impairment charge	0
Weighted average remaining lives of acquired intangible assets				6 years		15 years	15 years		1 year	25 years
Amortization expense for intangibles	5,100,000	5,600,000	5,000,000
Estimated annual amortization expense related to acquired intangible assets, 2014	5,000,000
Estimated annual amortization expense related to acquired intangible assets, 2015	5,000,000
Estimated annual amortization expense related to acquired intangible assets, 2016	5,000,000
Estimated annual amortization expense related to acquired intangible assets, 2017	5,000,000
Estimated annual amortization expense related to acquired intangible assets, 2018	$ 5,000,000