Segment Reporting - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information [Line Items]
Total net revenue	$ 260,007	$ 429,451	$ 729,711	$ 890,666
Total costs applicable to revenue	140,780	202,506	359,334	414,475
SG&A	136,582	182,278	330,323	376,154
Asset impairment	2,411	1,790	13,766	3,872
Debt issuance costs	136	0	136	0
Litigation settlement	0	0	4,395	0
Other expense (income), net	(92)	356	(158)	829
Depreciation and amortization	21,924	20,819	46,734	41,234
Interest expense, net	15,502	8,968	22,957	18,029
Earnings (loss) before income taxes	(57,236)	12,734	(47,776)	36,073
Products
Segment Reporting Information [Line Items]
Total net revenue	209,707	357,533	602,548	740,693
Total costs applicable to revenue	97,635	145,654	254,005	299,658
Services and plans
Segment Reporting Information [Line Items]
Total net revenue	50,300	71,918	127,163	149,973
Total costs applicable to revenue	43,145	56,852	105,329	114,817
Operating Segments | Owned & Host
Segment Reporting Information [Line Items]
Total net revenue	211,705	320,416	558,932	685,636
Total costs applicable to revenue	93,471	127,640	230,981	264,550
SG&A	86,704	126,078	221,418	259,291
Asset impairment	0	0	0	0
Debt issuance costs	0		0
Litigation settlement			0
Other expense (income), net	0	0	0	0
EBITDA	31,530	66,698	106,533	161,795
Operating Segments | Owned & Host | Products
Segment Reporting Information [Line Items]
Total net revenue	177,430	260,867	459,343	557,786
Total costs applicable to revenue	54,898	77,059	136,814	162,305
Operating Segments | Owned & Host | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	34,275	59,549	99,589	127,850
Total costs applicable to revenue	38,573	50,581	94,167	102,245
Operating Segments | Legacy
Segment Reporting Information [Line Items]
Total net revenue	25,413	39,264	61,870	83,842
Total costs applicable to revenue	13,665	18,582	31,658	39,013
SG&A	10,561	13,884	24,192	28,121
Asset impairment	0	0	0	0
Debt issuance costs	0		0
Litigation settlement			0
Other expense (income), net	0	0	0	0
EBITDA	1,187	6,798	6,020	16,708
Operating Segments | Legacy | Products
Segment Reporting Information [Line Items]
Total net revenue	16,254	25,785	40,672	55,926
Total costs applicable to revenue	9,093	12,312	20,496	26,442
Operating Segments | Legacy | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	9,159	13,479	21,198	27,916
Total costs applicable to revenue	4,572	6,270	11,162	12,571
Operating Segments | Corporate/Other
Segment Reporting Information [Line Items]
Total net revenue	50,472	62,346	117,044	126,227
Total costs applicable to revenue	42,135	54,254	100,045	110,849
SG&A	39,317	42,316	84,713	88,742
Asset impairment	2,411	1,790	13,766	3,872
Debt issuance costs	136		136
Litigation settlement			4,395
Other expense (income), net	(92)	356	(158)	829
EBITDA	(33,435)	(36,370)	(85,853)	(78,065)
Operating Segments | Corporate/Other | Products
Segment Reporting Information [Line Items]
Total net revenue	50,472	62,341	117,044	126,216
Total costs applicable to revenue	42,135	54,253	100,045	110,848
Operating Segments | Corporate/Other | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	0	5	0	11
Total costs applicable to revenue	0	1	0	1
Reconciliations
Segment Reporting Information [Line Items]
Total net revenue	(27,583)	7,425	(8,135)	(5,039)
Total costs applicable to revenue	(8,491)	2,030	(3,350)	63
SG&A	0	0	0	0
Asset impairment	0	0	0	0
Debt issuance costs	0		0
Litigation settlement			0
Other expense (income), net	0	0	0	0
EBITDA	(19,092)	5,395	(4,785)	(5,102)
Reconciliations | Products
Segment Reporting Information [Line Items]
Total net revenue	(34,449)	8,540	(14,511)	765
Total costs applicable to revenue	(8,491)	2,030	(3,350)	63
Reconciliations | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	6,866	(1,115)	6,376	(5,804)
Total costs applicable to revenue	$ 0	$ 0	$ 0	$ 0