Segment Reporting - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information [Line Items]
Total net revenue	$ 469,704	$ 461,215
Total costs applicable to revenue	218,554	211,969
SG&A	193,741	193,876
Asset impairment	11,355	2,082
Litigation settlement	4,395	0
Other expense (income), net	(66)	473
Other expense, net		473
Depreciation and amortization	24,810	20,415
Interest expense, net	7,455	9,061
Earnings before income taxes	9,460	23,339
Products
Segment Reporting Information [Line Items]
Total net revenue	392,841	383,160
Total costs applicable to revenue	156,370	154,004
Services and plans
Segment Reporting Information [Line Items]
Total net revenue	76,863	78,055
Total costs applicable to revenue	62,184	57,965
Operating Segments | Owned & Host
Segment Reporting Information [Line Items]
Total net revenue	347,227	365,220
Total costs applicable to revenue	137,511	136,910
SG&A	134,714	133,213
Asset impairment	0	0
Litigation settlement	0
Other expense (income), net	0
Other expense, net		0
EBITDA	75,002	95,097
Operating Segments | Owned & Host | Products
Segment Reporting Information [Line Items]
Total net revenue	281,914	296,919
Total costs applicable to revenue	81,917	85,246
Operating Segments | Owned & Host | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	65,313	68,301
Total costs applicable to revenue	55,594	51,664
Operating Segments | Legacy
Segment Reporting Information [Line Items]
Total net revenue	36,457	44,578
Total costs applicable to revenue	17,994	20,431
SG&A	13,631	14,237
Asset impairment	0	0
Litigation settlement	0
Other expense (income), net	0
Other expense, net		0
EBITDA	4,832	9,910
Operating Segments | Legacy | Products
Segment Reporting Information [Line Items]
Total net revenue	24,418	30,141
Total costs applicable to revenue	11,404	14,130
Operating Segments | Legacy | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	12,039	14,437
Total costs applicable to revenue	6,590	6,301
Operating Segments | Corporate/Other
Segment Reporting Information [Line Items]
Total net revenue	66,571	63,881
Total costs applicable to revenue	57,907	56,595
SG&A	45,396	46,426
Asset impairment	11,355	2,082
Litigation settlement	4,395
Other expense (income), net	(66)
Other expense, net		473
EBITDA	(52,416)	(41,695)
Operating Segments | Corporate/Other | Products
Segment Reporting Information [Line Items]
Total net revenue	66,571	63,875
Total costs applicable to revenue	57,907	56,595
Operating Segments | Corporate/Other | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	0	6
Total costs applicable to revenue	0	0
Reconciliations
Segment Reporting Information [Line Items]
Total net revenue	19,449	(12,464)
Total costs applicable to revenue	5,142	(1,967)
SG&A	0	0
Asset impairment	0	0
Litigation settlement	0
Other expense (income), net	0
Other expense, net		0
EBITDA	14,307	(10,497)
Reconciliations | Products
Segment Reporting Information [Line Items]
Total net revenue	19,938	(7,775)
Total costs applicable to revenue	5,142	(1,967)
Reconciliations | Services and plans
Segment Reporting Information [Line Items]
Total net revenue	(489)	(4,689)
Total costs applicable to revenue	$ 0	$ 0