Stockholders' Equity - Additional Information (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended		12 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended			3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 27, 2014	Sep. 26, 2014	Dec. 28, 2013 NASDAQ Telecom Composite Index [Member]	Sep. 27, 2014 IGN Index [Member]	Sep. 27, 2014 IGN Index [Member]	Sep. 27, 2014 Performance Stock Units Grants [Member]	Sep. 28, 2013 Performance Stock Units Grants [Member]	Sep. 27, 2014 Performance Stock Units Grants [Member]	Sep. 28, 2013 Performance Stock Units Grants [Member]	Dec. 29, 2012 Performance Stock Units Grants [Member]	Dec. 28, 2013 PSUs [Member] Minimum [Member]	Dec. 28, 2013 PSUs [Member] Maximum [Member]	Sep. 27, 2014 Restricted Stock Units [Member]	Sep. 28, 2013 Restricted Stock Units [Member]	Sep. 27, 2014 Restricted Stock Units [Member]	Sep. 28, 2013 Restricted Stock Units [Member]	Sep. 27, 2014 2007 Equity Incentive Plan [Member] NASDAQ Telecom Composite Index [Member] Minimum [Member]	Sep. 27, 2014 2007 Equity Incentive Plan [Member] NASDAQ Telecom Composite Index [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted options to employees to purchase shares of common stock (in shares)	17.5	17.5
Closing price of common stock (in usd per share)			$ 10.61
Number of shares available for grant cost (in shares)	0.1	2.4
Amortization of stock-based compensation							$ 0.6	$ 0.5	$ 1.5	$ 0.1				$ 5.6	$ 5.5	$ 15.9	$ 18.2
Shares of PSUs to executive officers (in shares)				0.6	0	0.4	0.1				0.5
Ranges of number of shares issued on vesting of PSUs												0	1.5					0	1.5
Amortization of stock based compensation expense offset										1.5
Decrease in fair value										$ 1.4