Segment Information (Schedule Of Revenue, Operating Income And Identifiable Assets By Segment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013	Jan. 03, 2014
Segment Reporting Information [Line Items]
Revenues	$ 584,796	$ 556,502	$ 1,831,716	$ 1,688,906
Consolidated segment operating income	11,089	63,029	183,934	184,391
Depreciation expense			24,068	19,630
Accounts receivable	358,504		358,504		337,932
Inventories	278,027		278,027		254,311
Goodwill	2,051,560		2,051,560		1,989,470
Engineering And Construction [Member]
Segment Reporting Information [Line Items]
Revenues	342,272	310,611	1,019,620	890,928
Accounts receivable	223,308		223,308		185,634
Inventories	185,908		185,908		171,863
Goodwill	1,144,409		1,144,409		1,080,240
Field Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	88,791	99,466	341,412	362,811
Accounts receivable	54,406		54,406		62,859
Inventories	48,003		48,003		39,554
Goodwill	85,884		85,884		88,651
Mobile Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	121,171	113,570	362,679	339,258
Accounts receivable	61,541		61,541		70,174
Inventories	28,080		28,080		27,664
Goodwill	797,536		797,536		796,094
Advanced Devices [Member]
Segment Reporting Information [Line Items]
Revenues	32,562	32,855	108,005	95,909
Accounts receivable	19,249		19,249		19,265
Inventories	16,036		16,036		15,230
Goodwill	23,731		23,731		24,485
Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated segment operating income	123,038	128,557	424,360	381,275
Depreciation expense	5,240	4,380	14,772	13,239
Operating Segments [Member] | Engineering And Construction [Member]
Segment Reporting Information [Line Items]
Consolidated segment operating income	70,553	73,488	219,952	183,301
Depreciation expense	3,416	2,990	9,746	8,838
Operating Segments [Member] | Field Solutions [Member]
Segment Reporting Information [Line Items]
Consolidated segment operating income	25,185	31,373	116,794	134,271
Depreciation expense	227	139	581	426
Operating Segments [Member] | Mobile Solutions [Member]
Segment Reporting Information [Line Items]
Consolidated segment operating income	18,209	15,276	54,764	42,284
Depreciation expense	1,447	1,056	3,957	3,393
Operating Segments [Member] | Advanced Devices [Member]
Segment Reporting Information [Line Items]
Consolidated segment operating income	9,091	8,420	32,850	21,419
Depreciation expense	$ 150	$ 195	$ 488	$ 582