Operating Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Mar. 30, 2013	Sep. 29, 2012 item	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Net revenue:
Total net revenue	$ 405.3		$ 403.3	$ 1,255.6	$ 1,228.4
Unallocated amounts:
Stock-based compensation	(15.3)		(13.3)	(41.5)	(37.1)
Acquisition-related charges and amortization of intangibles	(20.1)		(19.8)	(58.8)	(60.6)
Loss on disposal of long-lived assets	(0.2)		(0.2)	(1.6)	(0.9)
Restructuring and related charges	(0.4)		(2.0)	(6.1)	(7.5)
Other non-recurring charges	(12.9)		(0.3)	(13.6)	(9.6)
Interest and other income	(0.9)		0.2	(3.7)	2.2
Interest expense	(4.2)		(6.9)	(15.4)	(20.1)
Loss from continuing operations before income taxes	(26.4)		(13.1)	(25.4)	(18.0)
CommTest Low Speed Wireline Product Line Exit
Unallocated amounts:
Write-downs of inventories	11.3			11.3
Communications Test and Measurement
Net revenue:
Net Revenue	174.2		177.8	539.1	559.2
Operating income (loss):
Total operating income	13.0		20.1	65.1	72.2
Communications and Commercial Optical Products
Net revenue:
Net Revenue	179.2		173.1	559.9	516.6
Operating income (loss):
Total operating income	19.2		14.1	64.2	56.3
Corporate
Operating income (loss):
Total operating income	(23.2)		(23.5)	(70.0)	(65.9)
Optical Security and Performance Products
Information on reportable segments
Number of reporting units		1
Net revenue:
Net Revenue	51.9		52.4	156.6	153.2
Operating income (loss):
Total operating income	18.6		18.5	56.0	53.0
Operating Segments
Operating income (loss):
Total operating income	27.6		29.2	115.3	115.6
Purchase price adjustments to reconcile segment revenue to net revenue
Net revenue:
Deferred Revenue Related to Purchase Accounting Adjustment					$ (0.6)