Segment Reporting - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Segment Reporting Information [Line Items]
Total net revenue	$ 485,353	$ 431,902	$ 1,215,064	$ 1,322,568
Total costs applicable to revenue	210,809	204,502	570,143	618,978
SG&A	190,518	190,290	520,841	566,444
Asset impairment	7,150	3,516	20,916	7,387
Litigation settlement	0	0	4,395	0
Other expense (income), net	(154)	146	(312)	975
Debt issuance costs	0	0	136	0
Loss on extinguishment of debt	0	9,786	0	9,786
Depreciation and amortization	22,236	22,336	68,970	63,570
Interest expense, net	12,475	7,873	35,432	25,902
Income (loss) before income taxes	42,319	(6,547)	(5,457)	29,526
Products
Segment Reporting Information [Line Items]
Total net revenue	403,336	355,789	1,005,884	1,096,482
Total costs applicable to revenue	148,274	144,518	402,279	444,177
Services and plans
Segment Reporting Information [Line Items]
Total net revenue	82,017	76,113	209,180	226,086
Total costs applicable to revenue	62,535	59,984	167,864	174,801
Operating Segments | Owned & Host
Segment Reporting Information [Line Items]
Total net revenue	396,400	333,438	955,331	1,019,074
Total costs applicable to revenue	142,625	131,135	373,606	395,685
SG&A	128,206	128,054	349,624	387,345
Asset impairment	0	0	0	0
Litigation settlement			0
Other expense (income), net	0	0	0	0
Debt issuance costs			0
Loss on extinguishment of debt		0		0
EBITDA	125,569	74,249	232,101	236,044
Operating Segments | Owned & Host | Products
Segment Reporting Information [Line Items]
Total net revenue	323,159	270,171	782,502	827,957
Total costs applicable to revenue	86,945	77,670	223,759	239,975
Operating Segments | Owned & Host | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	73,241	63,267	172,829	191,117
Total costs applicable to revenue	55,680	53,465	149,847	155,710
Operating Segments | Legacy
Segment Reporting Information [Line Items]
Total net revenue	40,232	39,355	102,102	123,197
Total costs applicable to revenue	17,784	18,200	49,443	57,213
SG&A	13,068	13,920	37,260	42,041
Asset impairment	0	0	0	0
Litigation settlement			0
Other expense (income), net	0	0	0	0
Debt issuance costs			0
Loss on extinguishment of debt		0		0
EBITDA	9,380	7,235	15,399	23,943
Operating Segments | Legacy | Products
Segment Reporting Information [Line Items]
Total net revenue	24,900	25,252	65,572	81,178
Total costs applicable to revenue	11,676	11,681	32,173	38,123
Operating Segments | Legacy | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	15,332	14,103	36,530	42,019
Total costs applicable to revenue	6,108	6,519	17,270	19,090
Operating Segments | Corporate/Other
Segment Reporting Information [Line Items]
Total net revenue	57,906	63,174	174,950	189,401
Total costs applicable to revenue	50,901	55,684	150,945	166,534
SG&A	49,244	48,316	133,957	137,058
Asset impairment	7,150	3,516	20,916	7,387
Litigation settlement			4,395
Other expense (income), net	(154)	146	(312)	975
Debt issuance costs			136
Loss on extinguishment of debt		9,786		9,786
EBITDA	(49,235)	(54,274)	(135,087)	(132,339)
Operating Segments | Corporate/Other | Products
Segment Reporting Information [Line Items]
Total net revenue	57,906	63,173	174,950	189,389
Total costs applicable to revenue	50,154	55,684	150,198	166,533
Operating Segments | Corporate/Other | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	0	1	0	12
Total costs applicable to revenue	747	0	747	1
Reconciliations
Segment Reporting Information [Line Items]
Total net revenue	(9,185)	(4,065)	(17,319)	(9,104)
Total costs applicable to revenue	(501)	(517)	(3,851)	(454)
SG&A	0	0	0	0
Asset impairment	0	0	0	0
Litigation settlement			0
Other expense (income), net	0	0	0	0
Debt issuance costs			0
Loss on extinguishment of debt		0		0
EBITDA	(8,684)	(3,548)	(13,468)	(8,650)
Reconciliations | Products
Segment Reporting Information [Line Items]
Total net revenue	(2,629)	(2,807)	(17,140)	(2,042)
Total costs applicable to revenue	(501)	(517)	(3,851)	(454)
Reconciliations | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	(6,556)	(1,258)	(179)	(7,062)
Total costs applicable to revenue	$ 0	$ 0	$ 0	$ 0