Operating Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Dec. 29, 2012	Sep. 29, 2012 item	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Net revenue:
Total net revenue	$ 429.4		$ 409.3	$ 850.3	$ 825.1
Unallocated amounts:
Stock-based compensation	(13.6)		(12.3)	(26.2)	(23.8)
Acquisition-related charges and amortization of intangibles	(17.3)		(21.1)	(38.7)	(40.8)
Loss on disposal of long-lived assets	(0.1)		(0.2)	(1.4)	(0.7)
Restructuring and related charges	(3.0)		(4.0)	(5.7)	(5.5)
Realignment and other charges	(0.1)		(1.5)	(0.7)	(9.3)
Interest and other income	(2.4)		1.0	(2.8)	2.0
Interest expense	(5.1)		(6.6)	(11.2)	(13.2)
Income (loss) from continuing operations before income taxes	7.4		(4.7)	1.0	(4.9)
Communications Test and Measurement
Net revenue:
Net Revenue	195.4		196.2	364.9	381.4
Operating income (loss):
Total operating income	35.3		28.0	52.1	52.1
Communications and Commercial Optical Products
Net revenue:
Net Revenue	185.8		163.2	380.7	343.5
Operating income (loss):
Total operating income	21.2		16.6	45.0	42.2
Corporate
Operating income (loss):
Total operating income	(23.7)		(21.4)	(46.8)	(42.4)
Optical Security and Performance Products
Information on reportable segments
Number of reporting units		1
Net revenue:
Net Revenue	48.2		50.2	104.7	100.8
Operating income (loss):
Total operating income	16.2		16.8	37.4	34.5
Operating Segments
Operating income (loss):
Total operating income	49.0		40.0	87.7	86.4
Purchase price adjustments to reconcile segment revenue to net revenue
Net revenue:
Deferred Revenue Related to Purchase Accounting Adjustment			$ 0.3		$ 0.6