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Cash and Cash Equivalents - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 29, 2013
Dec. 29, 2012
Cash And Cash Equivalents [Abstract]    
Highly liquid investments maximum maturity period Three months or less  
Cash balance $ 41.3 $ 38.0
Cash equivalents 36.8 33.6
U.S. Treasury bills 35.0 32.0
Money market funds $ 1.8 $ 1.6