Segment Reporting - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net revenue	$ 355,922	$ 387,425	$ 385,532	$ 407,975	$ 321,819	$ 346,089	$ 337,541	$ 369,859	$ 1,536,854	$ 1,375,308	$ 1,196,195
Total costs applicable to revenue	$ 173,470	$ 182,588	$ 177,059	$ 180,454	$ 152,393	$ 162,358	$ 156,408	$ 165,808	713,571	636,966	544,781
SG&A									687,476	600,010	525,869
Asset impairment									17,630	4,117	7,132
Debt issuance costs									200	4,527	0
Litigation settlement									0	7,000	0
Other expense, net									1,487	950	1,667
EBITDA									116,490	121,738	116,746
Depreciation and amortization									74,339	61,974	52,677
Interest expense, net									37,283	55,536	39,092
Earnings before income taxes									4,868	4,228	24,977
Products
Segment Reporting Information [Line Items]
Total net revenue									1,269,612	1,129,313	980,953
Total costs applicable to revenue									511,406	456,078	390,369
Services and plans
Segment Reporting Information [Line Items]
Total net revenue									267,242	245,995	215,242
Total costs applicable to revenue									202,165	180,888	154,412
Operating Segments | Owned & Host
Segment Reporting Information [Line Items]
Total net revenue									1,173,402	1,038,567	889,408
Total costs applicable to revenue									459,082	402,239	340,112
SG&A									457,618	403,848	345,469
Asset impairment									0	0	0
Debt issuance costs									0	0
Litigation settlement										0
Other expense, net									0	0	0
EBITDA									256,702	232,480	203,827
Operating Segments | Owned & Host | Products
Segment Reporting Information [Line Items]
Total net revenue									956,355	847,866	730,741
Total costs applicable to revenue									280,720	248,548	212,208
Operating Segments | Owned & Host | Services and plans
Segment Reporting Information [Line Items]
Total net revenue									217,047	190,701	158,667
Total costs applicable to revenue									178,362	153,691	127,904
Operating Segments | Legacy
Segment Reporting Information [Line Items]
Total net revenue									154,412	153,842	152,210
Total costs applicable to revenue									67,258	64,899	59,607
SG&A									54,091	52,705	52,925
Asset impairment									0	0	0
Debt issuance costs									0	0
Litigation settlement										0
Other expense, net									0	0	0
EBITDA									33,063	36,238	39,678
Operating Segments | Legacy | Products
Segment Reporting Information [Line Items]
Total net revenue									103,890	103,887	103,618
Total costs applicable to revenue									46,986	48,275	48,097
Operating Segments | Legacy | Services and plans
Segment Reporting Information [Line Items]
Total net revenue									50,522	49,955	48,592
Total costs applicable to revenue									20,272	16,624	11,510
Operating Segments | Corporate/Other
Segment Reporting Information [Line Items]
Total net revenue									212,427	191,890	168,616
Total costs applicable to revenue									186,990	170,362	146,255
SG&A									175,767	143,457	127,475
Asset impairment									17,630	4,117	7,132
Debt issuance costs									200	4,527
Litigation settlement										7,000
Other expense, net									1,487	950	1,667
EBITDA									(169,647)	(138,523)	(113,913)
Operating Segments | Corporate/Other | Products
Segment Reporting Information [Line Items]
Total net revenue									208,875	179,718	151,083
Total costs applicable to revenue									183,459	159,789	131,257
Operating Segments | Corporate/Other | Services and plans
Segment Reporting Information [Line Items]
Total net revenue									3,552	12,172	17,533
Total costs applicable to revenue									3,531	10,573	14,998
Reconciling Items
Segment Reporting Information [Line Items]
Total net revenue									(3,387)	(8,991)	(14,039)
Total costs applicable to revenue									241	(534)	(1,193)
SG&A									0	0	0
Asset impairment									0	0	0
Debt issuance costs									0	0
Litigation settlement										0
Other expense, net									0	0	0
EBITDA									(3,628)	(8,457)	(12,846)
Reconciling Items | Products
Segment Reporting Information [Line Items]
Total net revenue									492	(2,158)	(4,489)
Total costs applicable to revenue									241	(534)	(1,193)
Reconciling Items | Services and plans
Segment Reporting Information [Line Items]
Total net revenue									(3,879)	(6,833)	(9,550)
Total costs applicable to revenue									$ 0	$ 0	$ 0