Reporting Segment And Geographic Information (Schedule Of Revenue, Operating Income And Identifiable Assets By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 03, 2014	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 28, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Jan. 03, 2014		Dec. 28, 2012		Dec. 30, 2011
Segment Reporting Information [Line Items]
Revenue	$ 599,218	$ 556,502	$ 576,293	$ 556,111	$ 515,523	$ 504,763	$ 517,560	$ 502,267	$ 2,288,124	[1]	$ 2,040,113	[1]	$ 1,644,065	[1]
Operating Income (Loss)									251,737		212,568		156,402
Depreciation									26,736		23,691		20,509
Accounts receivable	337,932				323,477				337,932		323,477		275,201
Inventories	254,311				240,529				254,311		240,529		232,063
Goodwill	1,989,470				1,815,699				1,989,470		1,815,699		1,297,692
Number of Reportable Segments									4
Maximum percentage of operation accounts for company's total revenue, operating income, and assets									10.00%
Engineering And Construction [Member]
Segment Reporting Information [Line Items]
Revenue									1,222,040		1,089,424		906,497
Accounts receivable	185,634				171,580				185,634		171,580		160,218
Inventories	171,863				148,241				171,863		148,241		128,433
Goodwill	1,080,240				958,103				1,080,240		958,103		697,237
Field Solutions [Member]
Segment Reporting Information [Line Items]
Revenue									473,891		481,962		413,721
Accounts receivable	62,859				71,465				62,859		71,465		63,542
Inventories	39,554				44,738				39,554		44,738		51,756
Goodwill	88,651				68,684				88,651		68,684		68,268
Mobile Solutions [Member]
Segment Reporting Information [Line Items]
Revenue									465,138		348,147		218,540
Accounts receivable	70,174				59,720				70,174		59,720		36,465
Inventories	27,664				30,598				27,664		30,598		31,262
Goodwill	796,094				763,386				796,094		763,386		508,260
Advanced Devices [Member]
Segment Reporting Information [Line Items]
Revenue									127,055		120,580		105,307
Accounts receivable	19,265				20,712				19,265		20,712		14,976
Inventories	15,230				16,952				15,230		16,952		20,612
Goodwill	24,485				25,526				24,485		25,526		23,927
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									514,910		440,933		327,506
Operating Segments [Member] | Engineering And Construction [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									251,258		207,174		149,015
Operating Segments [Member] | Field Solutions [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									173,114		182,134		160,139
Operating Segments [Member] | Mobile Solutions [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									63,961		32,459		4,461
Operating Segments [Member] | Advanced Devices [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									26,577		19,166		13,891
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Depreciation									18,021		15,677		13,231
Segment Reconciling Items [Member] | Engineering And Construction [Member]
Segment Reporting Information [Line Items]
Depreciation									12,022		10,563		9,581
Segment Reconciling Items [Member] | Field Solutions [Member]
Segment Reporting Information [Line Items]
Depreciation									633		555		595
Segment Reconciling Items [Member] | Mobile Solutions [Member]
Segment Reporting Information [Line Items]
Depreciation									4,579		3,679		2,154
Segment Reconciling Items [Member] | Advanced Devices [Member]
Segment Reporting Information [Line Items]
Depreciation									$ 787		$ 880		$ 901

[1] Revenue is attributed to countries based on the location of the customer.