Revenue Disclosures - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 08, 2019	Dec. 30, 2018
Advertising fund assets restricted	$ 109,490	$ 112,744	[1]
U.S. stores [Member] | U.S. franchise stores [Member] | Cash, cash equivalents and investments [Member]
Advertising fund assets restricted	88,700	95,100
U.S. stores [Member] | U.S. franchise stores [Member] | Prepaid expenses [Member]
Advertising fund assets restricted	2,500	2,300
U.S. stores [Member] | U.S. franchise stores [Member] | Accounts receivable [Member]
Advertising fund assets restricted	18,300	15,300
U.S. stores [Member] | U.S. Company-owned stores [Member]
Cash contributed from Company-owned stores	$ 4,600	$ 5,500

[1] The balance sheet at December 30, 2018 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.