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Variable Interest Entities (VIEs) - Condensed Consolidating Schedules of Statements of Comprehensive Income (Detail) - 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
Statement of Comprehensive Income [Abstract]
Total revenue	$ 223,132	$ 210,583	$ 211,621	$ 212,953	$ 207,939	$ 193,360	$ 192,306	$ 196,643	$ 858,289	$ 790,248	$ 712,898
Cost of goods sold									283,397	268,216	234,560
Gross profit	148,331	140,753	142,147	143,661	138,652	124,065	126,901	132,414	574,892	522,032	478,338
Operating expenses:
Selling, general and administrative									289,456	276,292	254,707
Research and development									76,967	61,953	57,686
Litigation settlement, award and/or defense costs									425	0	(270,000)
Total operating expenses									366,848	338,245	42,393
Operating income	53,906	48,641	51,612	53,885	44,726	43,061	43,849	52,151	208,044	183,787	435,945
Non-operating (income) expense									(5,732)	(2,013)	2,429
Income before provision for income taxes									213,776	185,800	433,516
Provision for income taxes									20,233	61,011	122,419
Net income									$ 193,543	124,789	311,097
Net income	$ 46,934	$ 57,126	$ 43,853	$ 45,630	$ (7,735)	$ 35,853	$ 45,138	$ 51,533		$ 124,789	$ 311,097

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