Commitments and Contingencies (Narrative) (Details) (USD $)	3 Months Ended					3 Months Ended						3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 30, 2013 Indemnification Agreement [Member]	Dec. 31, 2012 Indemnification Agreement [Member]	Mar. 30, 2013 TECH [Member]	Mar. 31, 2012 TECH [Member]	Mar. 30, 2013 TECH [Member] Layaway Sale [Member]	Mar. 31, 2012 TECH [Member] Layaway Sale [Member]	Dec. 31, 2012 TECH [Member] Layaway Sale [Member]	Dec. 31, 2012 TECH [Member] Layaway Sale [Member] Other Current Assets [Member]	Dec. 31, 2012 2GIG Technologies, Inc. [Member]
Commitments and Contingencies [Line Items]
Recorded liabilities in relation to indemnifications				$ 5,200,000	$ 5,300,000
Recorded liabilities in relation to indemnifications, Current				2,300,000	2,300,000
Recorded liabilities in relation to indemnifications, noncurrent				2,900,000	3,000,000
Undiscounted future payments related to indemnifications				5,500,000	5,700,000
Deferred revenue										6,300,000
Recognition of Deferred Revenue								6,300,000	7,300,000
Cost basis of inventory shipped											5,100,000
Inventories, net	271,800,000		258,400,000					12,500,000		5,800,000
Acquisition of customer by third party, consideration transferred												2,000,000,000
Net Sales	$ 519,100,000	$ 522,800,000				$ 110,400,000	$ 95,300,000	$ 24,100,000