Business Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 30, 2012		Sep. 30, 2012		Jul. 01, 2012		Apr. 01, 2012		Jan. 01, 2012		Oct. 02, 2011		Jul. 03, 2011		Apr. 03, 2011		Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011
Sales
Sales	$ 567.4	[1]	$ 547.4	[1]	$ 518.5	[1]	$ 494.0	[1]	$ 474.5	[2]	$ 496.4	[2]	$ 502.9	[2]	$ 468.1	[2]	$ 2,127.3	$ 1,941.9	$ 1,644.2
Income before taxes
Total segment operating profit																	243.1	227.2	178.5
Corporate expense																	(36.7)	(33.7)	(28.8)
Other income/(expense), net																	2.9	0.6	1.6
Interest and debt expense, net																	(17.8)	(16.2)	(6.5)
Income from continuing operations before income taxes																	228.2	211.6	173.6
Depreciation and amortization																	78.3	64.2	45.2
Capital expenditures																	65.3	41.7	31.0
Identifiable assets	2,406.4								1,826.1								2,406.4	1,826.1	1,557.8
Operating Segments [Member]
Income before taxes
Total segment operating profit																	279.8	260.9	207.3
Instrumentation [Member]
Sales
Sales																	749.4	616.6	573.2
Income before taxes
Total segment operating profit																	136.2	122.8	113.9
Depreciation and amortization																	23.5	16.3	16.6
Capital expenditures																	13.2	8.9	6.4
Identifiable assets	945.9								545.0								945.9	545.0	575.0
Digital Imaging [Member]
Sales
Sales																	415.9	349.9	122.5
Income before taxes
Total segment operating profit																	24.8	16.1	5.2
Depreciation and amortization																	30.5	26.9	9.3
Capital expenditures																	23.5	13.8	11.3
Identifiable assets	778.1								638.8								778.1	638.8	192.0
Aerospace and Defense Electronics [Member]
Sales
Sales																	660.6	670.8	614.7
Income before taxes
Total segment operating profit																	90.3	93.9	57.8
Depreciation and amortization																	19.7	16.9	16.0
Capital expenditures																	13.8	13.1	9.7
Identifiable assets	534.2								479.3								534.2	479.3	460.7
Engineered Systems [Member]
Sales
Sales																	301.4	304.6	333.8
Income before taxes
Total segment operating profit																	28.5	28.1	30.4
Depreciation and amortization																	4.4	4.0	3.1
Capital expenditures																	4.2	5.9	3.6
Identifiable assets	102.3								115.1								102.3	115.1	106.9
Corporate [Member]
Income before taxes
Depreciation and amortization																	0.2	0.1	0.2
Capital expenditures																	10.6	0	0
Identifiable assets	45.9								47.9								45.9	47.9	148.1
Discontinued Operations [Member]
Income before taxes
Identifiable assets	$ 0								$ 0								$ 0	$ 0	$ 75.1

[1] Fiscal year 2012 was a 52-week year, each quarter contained 13 weeks.

[2] Fiscal year 2011 was a 52-week year, each quarter contained 13 weeks.