Quarterly report pursuant to Section 13 or 15(d)

Business Combinations - Summary of Preliminary Recording of Fair Values of Assets Acquired and Liabilities Assumed (Detail)

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Business Combinations - Summary of Preliminary Recording of Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2013
Sep. 28, 2013
Dec. 29, 2012
Business Acquisition [Line Items]      
Goodwill $ 205,756 $ 205,756 $ 210,223
FourStar Microbial [Member]
      
Business Acquisition [Line Items]      
Current assets, net of cash and cash equivalents acquired     220
Fixed assets     40
Goodwill     3,243
Intangible assets     7,102
Other long-term assets     0
Current liabilities     (13)
Current portion of long-term debt     0
Other long-term liabilities     (4,165)
Fair values of the assets acquired and liabilities assumed     6,427
Assets of aquiree recorded prior to purchase of majority interest     (1,592)
Net assets acquired, less cash and cash equivalents     4,835
Amounts Previously Recognized as of Acquisition Date [Member] | FourStar Microbial [Member]
      
Business Acquisition [Line Items]      
Current assets, net of cash and cash equivalents acquired     220
Fixed assets     40
Goodwill     0
Intangible assets     1,144
Other long-term assets     5,406
Current liabilities     (13)
Current portion of long-term debt     0
Other long-term liabilities     0
Fair values of the assets acquired and liabilities assumed     6,797
Assets of aquiree recorded prior to purchase of majority interest     (1,962)
Net assets acquired, less cash and cash equivalents     4,835
Measurement Period Adjustments [Member] | FourStar Microbial [Member]
      
Business Acquisition [Line Items]      
Current assets, net of cash and cash equivalents acquired     0
Fixed assets     0
Goodwill     3,243
Intangible assets     5,958
Other long-term assets     (5,406)
Current liabilities     0
Current portion of long-term debt     0
Other long-term liabilities     (4,165)
Fair values of the assets acquired and liabilities assumed     (370)
Assets of aquiree recorded prior to purchase of majority interest     370
Net assets acquired, less cash and cash equivalents     $ 0