Restructuring and Related Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended										3 Months Ended		3 Months Ended										3 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Jun. 30, 2012	Sep. 29, 2012 Communications and Commercial Optical Products employee	Sep. 29, 2012 CCOP CPV Plan	Sep. 29, 2012 CommTest Operation and Repair Outsourcing Restructuring Plan employee	Sep. 29, 2012 OSP Business Consolidation Plan employee	Sep. 29, 2012 CommTest Manufacturing Support Consolidation Plan employee	Sep. 29, 2012 CommTest Manufacturing Support Consolidation Plan Communications Test and Measurement employee	Sep. 29, 2012 CommTest Solutions Business Restructuring Plan employee	Sep. 29, 2012 CommTest Solutions Business Restructuring Plan Communications Test and Measurement employee	Sep. 29, 2012 Other plans	Sep. 29, 2012 Maryland and Indiana in the United States CommTest US Manufacturing Outsourcing Restructuring Plan Communications Test and Measurement	Jun. 27, 2009 Germany CommTest Germany Restructuring Plan Communications Test and Measurement employee	Sep. 29, 2012 Germany CommTest Germany Restructuring Plan Communications Test and Measurement employee	Sep. 29, 2012 Workforce reduction CommTest Operation and Repair Outsourcing Restructuring Plan	Sep. 29, 2012 Workforce reduction CommTest Manufacturing Support Consolidation Plan	Sep. 29, 2012 Workforce reduction CommTest Solutions Business Restructuring Plan	Sep. 29, 2012 Workforce reduction CommTest Germany Restructuring Plan	Sep. 29, 2012 Workforce reduction Other plans	Sep. 29, 2012 Facilities and Equipment CommTest Operation and Repair Outsourcing Restructuring Plan	Apr. 02, 2011 Facilities and Equipment CommTest Market Rebalancing Restructuring Plan Communications Test and Measurement facility	Sep. 29, 2012 Lease Costs CommTest Operation and Repair Outsourcing Restructuring Plan	Sep. 29, 2012 Lease Costs CommTest Germantown Tower Restructuring Plan	Jun. 30, 2012 Lease Costs CommTest Germantown Tower Restructuring Plan	Sep. 29, 2012 Lease Costs CommTest Market Rebalancing Restructuring Plan	Sep. 29, 2012 Lease Costs CommTest US Manufacturing Outsourcing Restructuring Plan	Sep. 29, 2012 Lease Costs Other plans	Sep. 29, 2012 Ottawa Lease Exit Costs
Restructuring and Related Charges
Number of employees expected to be reduced				13		114	17		74		57			77
Number of positions eliminated as of the balance sheet date						91	5	35		56
Additional severance and employee benefits						$ 0.9
Fair value of the remaining contractual obligations, net of sublease income						0.4
Number of positions eliminated as of the balance sheet date															71
Contractual obligations under the operating lease, net of sublease income, fair value	4.6		4.6										1.0
Summary of various restructuring plans
Accrual balance at the beginning of the period	12.6					3.9	0.8					0.3				3.9	2.5	0.2	2.4	0.2				0.5	0.5	0.9	1.1	0.1	4.6
Restructuring and related charges	2.7	1.5		0.6	0.6	1.9										0.9	0.1		0.1		0.5		0.5						0.1
Cash Settlements	(4.5)					(3.2)	(0.2)					(0.1)				(2.6)	(0.5)	(0.1)	(0.2)	(0.1)	(0.5)		(0.1)			(0.1)	(0.1)		(0.3)
Non-cash settlements and other adjustments	0.5											0.4							0.1									0.4	0.2
Accrual balance at the end of the period	$ 11.3				$ 0.6	$ 2.6	$ 0.6					$ 0.6				$ 2.2	$ 2.1	$ 0.1	$ 2.4	$ 0.1			$ 0.4	$ 0.5	$ 0.5	$ 0.8	$ 1.0	$ 0.5	$ 4.6
Number of facilities exited																						3