Acquisitions - Summary of Fair Values of Acquired Assets and Assumed Liabilities as of Acquisition Date (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Dec. 29, 2013	Sep. 29, 2013	Sep. 28, 2014 Johnson City And Morristown Territory Acquisition [Member]	May 23, 2014 Johnson City And Morristown Territory Acquisition [Member]
Schedule Of Finite And Indefinite Lived Assets Acquired And Liabilities Assumed By Major Class [Line Items]
Cash					$ 46
Inventories					1,361
Prepaid expense and other current assets					252
Property, plant and equipment					8,495
Other assets					10
Goodwill	103,294	102,049	102,049	1,245	1,245
Other identifiable intangible assets					13,800
Total acquired assets					25,209
Current liabilities (acquisition related contingent consideration)					1,005
Other liabilities (acquisition related contingent consideration)					11,995
Total assumed liabilities					$ 13,000