Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Summary of Significant Accounting Policies (Textuals) [Abstract]
Fair value of cash and cash equivalents based on quoted market prices in active markets Level 1 valuation	$ 74,700,000		$ 74,700,000
Other income related to escrow settlement related to indemnification for certain tax matters	0	1,465,000	0	1,465,000
Trapeze Networks, Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest and losses related to discontinued operations		2,600,000		5,800,000
losses, including interest expense, related to discontinued operations, net of tax		1,700,000		4,200,000
Communications cable operation in Phoenix, Arizona [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest and losses related to discontinued operations	300,000	300,000	500,000	500,000
losses, including interest expense, related to discontinued operations, net of tax	200,000	200,000	300,000	300,000
Bank Guaranties [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued	7,100,000		7,100,000
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued	10,700,000		10,700,000
Surety Bonds [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued	$ 1,700,000		$ 1,700,000