Revisions to Applicable Consolidated Statements of Cash Flows Line Item to Correct the Errors (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Other assets	$ (11,107)	$ (12,899)	$ (11,337)
Other accrued liabilities	12,389	4,504	(17,995)
Net cash provided by operating activities	346,044	318,301	315,183
Repurchase of independent distributor territories	(10,350)	(13,768)	(16,198)
Principal payments from notes receivable	22,272	23,023	21,103
Other investing activities	2,091	839	544
Net cash disbursed for investing activities	(70,047)	(461,576)	(34,526)
Distributor routes sold with gains recognized as deferred income, net	5,213	166	11,443
Distributor Notes Receivable
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Issuance of notes receivable on new distribution territories, net	$ 23,352	15,739	41,731
As Previously Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Other assets		(7,133)	(23,993)
Other accrued liabilities		4,670	(6,552)
Net cash provided by operating activities		324,233	313,970
Repurchase of independent distributor territories		(21,866)	(17,056)
Principal payments from notes receivable		26,028	23,718
Net cash disbursed for investing activities		(467,508)	(33,313)
As Previously Reported | Distributor Notes Receivable
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Issuance of notes receivable on new distribution territories, net		18,744	44,346
Revisions
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Other assets		(5,766)	12,656
Other accrued liabilities		(166)	(11,443)
Net cash provided by operating activities		(5,932)	1,213
Repurchase of independent distributor territories		8,098	858
Principal payments from notes receivable		(3,005)	(2,615)
Other investing activities		839	544
Net cash disbursed for investing activities		5,932	(1,213)
Distributor routes sold with gains recognized as deferred income, net		166	11,443
Revisions | Distributor Notes Receivable
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Issuance of notes receivable on new distribution territories, net		$ (3,005)	$ (2,615)