Mergers and Acquisitions (Details) (USD $) In Millions, unless otherwise specified			0 Months Ended		0 Months Ended			0 Months Ended						0 Months Ended			0 Months Ended			0 Months Ended	3 Months Ended	0 Months Ended
	Mar. 29, 2014	Jun. 29, 2013	Jan. 06, 2014 Network Instruments item	Jan. 06, 2014 Network Instruments In-process research and development	Jan. 06, 2014 Network Instruments Developed technology	Jan. 06, 2014 Network Instruments Customer relationships	Jan. 06, 2014 Network Instruments Other	Jan. 06, 2014 Network Instruments Trademark/tradename	Jan. 27, 2014 Time-Bandwidth Products AG	Jan. 27, 2014 Time-Bandwidth Products AG Developed technology	Jan. 27, 2014 Time-Bandwidth Products AG Customer relationships	Dec. 10, 2013 Trendium	Dec. 10, 2013 Trendium In-process research and development	Dec. 10, 2013 Trendium Developed technology	Mar. 07, 2013 Arieso	Jun. 29, 2013 Arieso	Mar. 07, 2013 Arieso Developed technology	Mar. 07, 2013 Arieso Customer relationships	Mar. 07, 2013 Arieso Order backlog	Aug. 17, 2012 GenComm	Mar. 29, 2014 GenComm	Aug. 17, 2012 GenComm Developed technology	Aug. 17, 2012 GenComm Customer relationships	Aug. 17, 2012 GenComm Order backlog
Acquisitions
Purchase price paid in cash			$ 208.5						$ 15.0			$ 26.1			$ 89.7					$ 15.2
Working capital adjustment and holdback payment			20.0						2.3			2.5			12.8					3.8
Number of tranches in which net holdback payments will be released			2
Holdback payments, minus any deductions for actual or pending claims to be paid in first tranche			10.0
Period after which the Holdback payments, minus any deductions for actual or pending claims will be released for first tranche			6 months
Holdback payments, minus any deductions for actual or pending claims to be paid in second tranche			10.0
Period after which the Holdback payments, minus any deductions for actual or pending claims will be released for second tranche			1 year
Minimum period after which the holdback payments will be released															1 year
Minimum period after which the holdback payments will be released									18 months			1 year
Holdback payment																					3.3
Purchase price allocation to assets acquired
Net tangible assets acquired			22.1						1.7						0.2					5.9
Intangible assets acquired				1.7									5.4
Intangible assets acquired					21.7	38.3	0.3			6.7	0.3			6.1			32.8	14.5	1.4			3.2	0.2	0.2
Goodwill	264.6	115.1	124.4						6.3			14.4			40.8					5.7
Total purchase price			208.5						15.0			26.1			89.7					15.2
Fair value of acquired tangible assets
Cash			9.0												4.1
Accounts receivable			13.8						1.4						8.4
Inventory			7.3						4.9
Property and equipment			1.0						1.3			0.2			0.6
Accounts payable			(1.5)						(0.6)						(0.3)
Accrued expenses and other liabilities, net of other assets			(4.4)						(3.6)						(1.4)
Employee related liabilities															(1.4)
Deferred revenue			(2.5)												(1.7)
Deferred tax liabilities, net			(0.6)						(1.7)						(8.1)
Net tangible assets acquired			22.1						1.7						0.2					5.9
Additional business acquisition information
Estimated useful lives of intangible assets					5 years	5 years		1 year		8 years	3 years			7 years			5 years	5 years				4 years	4 years
Acquisition-related costs																$ 1.8