Revisions to Applicable Consolidated Statements of Cash Flows Line Item to Correct the Errors (Detail) - USD ($)		3 Months Ended		4 Months Ended	12 Months Ended
		Oct. 07, 2017	Jul. 15, 2017	Apr. 22, 2017	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Other reconciling items to net income						$ (106,000)	$ 5,709,000
Other assets					$ (12,557,000)	(3,441,000)	(4,660,000)
Other accrued liabilities					42,770,000	11,390,000	4,504,000
Net cash provided by operating activities					297,389,000	356,562,000	335,674,000
Repurchase of independent distributor territories					(6,460,000)	(8,871,000)	(14,338,000)
Cash paid at issuance of notes receivable					(25,566,000)	(8,577,000)	(7,962,000)
Other investing activities					1,823,000	2,522,000	1,132,000
Net cash disbursed for investing activities					$ (35,395,000)	(76,714,000)	(469,815,000)
As reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Other reconciling items to net income						(3,957,000)	(3,425,000)
Other assets						(11,107,000)	(12,899,000)
Other accrued liabilities						12,389,000
Net cash provided by operating activities						346,044,000	318,301,000
Repurchase of independent distributor territories						(10,350,000)	(13,768,000)
Other investing activities						2,091,000	839,000
Net cash disbursed for investing activities						(70,047,000)	(461,576,000)
Revisions
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Other assets						7,666,000	8,239,000
Other accrued liabilities						(999,000)
Net cash provided by operating activities		$ (12,800)	$ (12,100)	$ (5,900)		6,667,000	8,239,000
Repurchase of independent distributor territories						1,479,000	(570,000)
Cash paid at issuance of notes receivable						(8,577,000)	(7,962,000)
Other investing activities						431,000	293,000
Net cash disbursed for investing activities		$ (12,800)	$ (12,100)	$ (5,900)		(6,667,000)	(8,239,000)
New Guidance
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Other reconciling items to net income	[1]					3,851,000	9,134,000
Net cash provided by operating activities	[1]					$ 3,851,000	$ 9,134,000

[1] The tables above include the impact of adopting new share-based payment guidance discussed in Note 3, Recent Accounting Pronouncements.