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Acquired Developed Technology and Other Intangibles (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
	Jan. 06, 2014	Dec. 10, 2013	Oct. 03, 2015	Jul. 02, 2016	Jun. 27, 2015	Jun. 28, 2014
Acquired developed technology, customer relationships and other intangibles
Gross carrying amount of finite lived intangibles					$ 617.1
Accumulated Amortization				$ (415.8)	(528.3)
Net carrying amount of finite lived intangibles					88.8
Net Carrying amount of in-process research and development intangibles					1.8
Gross Carrying Amount				475.7	618.9
Net carrying amount of intangibles				59.9	90.6
Intangible assets transferred from indefinite to finite-lived intangible assets			$ (1.8)
Cost of sales				17.3	31.9	$ 34.1
Operating expense				14.6	19.5	15.5
Amortization expense				31.9	51.4	$ 49.6
Estimated future amortization expense
2017				28.5
2018				20.4
2019				9.3
2020				1.4
Thereafter				0.3
Net carrying amount of intangibles				59.9
Acquired developed technology
Acquired developed technology, customer relationships and other intangibles
Gross carrying amount of finite lived intangibles				369.3	418.9
Accumulated Amortization				(337.3)	(373.6)
Net carrying amount of finite lived intangibles				$ 32.0	45.3
Useful life of intangible assets				36 months
Acquired developed technology | Network Instruments, LLC (Network Instruments)
Acquired developed technology, customer relationships and other intangibles
Useful life of intangible assets	5 years
Acquired developed technology | Trendium Inc. (Trendium)
Acquired developed technology, customer relationships and other intangibles
Useful life of intangible assets		7 years
Customer relationships
Acquired developed technology, customer relationships and other intangibles
Gross carrying amount of finite lived intangibles				$ 95.6	178.7
Accumulated Amortization				(68.0)	(135.8)
Net carrying amount of finite lived intangibles				27.6	42.9
Other
Acquired developed technology, customer relationships and other intangibles
Gross carrying amount of finite lived intangibles				10.8	19.5
Accumulated Amortization				(10.5)	(18.9)
Net carrying amount of finite lived intangibles				$ 0.3	$ 0.6
Completed in-process research and development | Network Instruments, LLC (Network Instruments)
Acquired developed technology, customer relationships and other intangibles
Useful life of intangible assets					52 months
Completion of in-process research and development project					$ 1.7
In-process research and development | Trendium Inc. (Trendium)
Acquired developed technology, customer relationships and other intangibles
Impairment charge					$ 3.6

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