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Restructuring and Related Charges - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended
Sep. 26, 2014
Sep. 27, 2013
Sep. 26, 2014
Sep. 27, 2013
Sep. 26, 2014
Harmonic 2013 Restructuring [Member]
Sep. 26, 2014
Harmonic 2013 Restructuring [Member]
Employees
Sep. 27, 2013
Harmonic 2013 Restructuring [Member]
Dec. 31, 2013
Harmonic 2013 Restructuring [Member]
Mar. 31, 2013
HFC business [Member]
Dec. 31, 2013
HFC business [Member]
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges $ 388,000 $ 259,000 $ 821,000 $ 925,000   $ 924,000 $ 1,455,000 $ 2,200,000 $ 600,000  
Restructuring Costs         403,000 915,000        
Restructuring Reserve         $ 347,000 $ 347,000   $ 179,000   $ 13,000
Number of positions eliminated           25