Goodwill - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Apr. 01, 2017		Apr. 02, 2016	Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 579,771			$ 593,037
Accumulated Amortization	(253,851)			(256,155)
Net	325,920			$ 336,882
Amortization of Intangible Assets	$ 12,900		$ 12,913
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life	10 years			10 years
Gross Carrying Amount	$ 465,655			$ 476,176
Accumulated Amortization	(246,521)			(247,206)
Net	$ 219,134			$ 228,970
Developed Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life	5 years			5 years
Gross Carrying Amount	$ 6,340			$ 9,140
Accumulated Amortization	(2,092)			(4,435)
Net	4,248			4,705
Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,776	[1]		6,721	[2]
Accumulated Amortization	(5,238)	[1]		(4,514)	[2]
Net	1,538	[1]		2,207	[2]
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,000			101,000
Accumulated Amortization	0			0
Net	$ 101,000			$ 101,000
Minimum [Member] | Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	2 years			2 years
Maximum [Member] | Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	5 years			5 years

[1] Consists of sales backlog and an amortizable trade name with useful lives ranging from two to five years.

[2] Consists of non-competition agreements, sales backlog, and an amortizable trade name with useful lives ranging from two to five years.