Operating Segments and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 28, 2014	Jun. 29, 2013	Jun. 30, 2012
Net revenue:
Total net revenue	$ 448.6	$ 418.0	$ 447.6	$ 429.0	$ 421.3	$ 405.3	$ 429.4	$ 420.9	$ 1,743.2	$ 1,676.9	$ 1,662.4
Unallocated amounts:
Stock-based compensation									(64.1)	(56.4)	(48.6)
Amortization of intangibles									(59.0)	(76.0)	(80.3)
Loss on disposal of long-lived assets									(2.0)	(3.6)	(1.2)
Restructuring and related charges	(20.0)	(3.6)	(1.0)	0.8	(12.9)	(0.4)	(3.0)	(2.7)	(23.8)	(19.0)	(12.4)
Other charges related to non-recurring activities									(3.6)	(15.7)	(11.0)
Interest and other income (expense), net	0.1	0.6	0.4	(0.6)	(0.4)	(0.9)	(2.4)	(0.4)	0.5	(4.1)	12.8
Interest expense	(8.4)	(7.7)	(8.4)	(5.2)	(2.5)	(4.2)	(5.1)	(6.1)	(29.7)	(17.9)	(27.3)
Loss from continuing operations before income taxes	(24.8)	(18.7)	11.8	0.8	(21.5)	(26.4)	7.4	(6.4)	(30.9)	(46.9)	(14.1)
Corporate
Operating income (loss):
Total operating income									(95.0)	(92.9)	(88.9)
Operating Segments
Operating income (loss):
Total operating income									150.8	145.8	153.9
Network and Service Enablement
Net revenue:
Net Revenue									748.3	728.9	755.4
Operating income (loss):
Total operating income									80.3	83.1	98.3
Communications and Commercial Optical Products
Net revenue:
Net Revenue									794.1	742.2	701.6
Operating income (loss):
Total operating income									93.5	82.4	72.0
Optical Security and Performance Products
Net revenue:
Net Revenue									200.8	205.8	206.0
Deferred revenue related to purchase accounting adjustment											(0.6)
Operating income (loss):
Total operating income									72.0	73.2	72.5
NSE's Speed Wireline Product Line Exit
Unallocated amounts:
Write-downs of inventories						$ 11.3