Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Oct. 02, 2011	Oct. 03, 2010
Summary of Significant Accounting Policies (Textual) [Abstract]
Fair value of cash and cash equivalents based on quoted market prices in active markets Level 1 valuation	$ 45,500,000		$ 45,500,000
Other income related to escrow settlement related to indemnification for certain tax matters				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		3,100,000		8,900,000
Losses, including interest expense, related to discontinued operations, net of tax		1,900,000		6,100,000
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	200,000	200,000	700,000	700,000
Losses, including interest expense, related to discontinued operations, net of tax	200,000	100,000	400,000	400,000
Bank Guaranties [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued	6,000,000		6,000,000
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued	10,400,000		10,400,000
Surety Bonds [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued	$ 1,700,000		$ 1,700,000