Effect of Derivative Instruments for Deferred Gains And (Losses) on Closed Contracts and Effective Portion in Fair Value on AOCI, Utilized for Risk Management Purposes (Detail) - USD ($) $ in Thousands		3 Months Ended												4 Months Ended				12 Months Ended
		Dec. 29, 2018	[1]	Oct. 06, 2018	[1],[2]	Jul. 14, 2018	[1],[2]	Dec. 30, 2017	[1]	Oct. 07, 2017	[1],[2]	Jul. 15, 2017	[1],[2]	Apr. 21, 2018	[1],[2]	Apr. 22, 2017	[1],[2]	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (Net of tax)																		$ 2,978	$ (6,789)	$ 5,730
Production costs		$ 467,155		$ 485,680		$ 488,871		$ 456,895		$ 476,264		$ 468,246		$ 625,122		$ 608,068		2,066,828	2,009,473	2,026,859
Income before income taxes																		197,161	149,293	249,537
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Income before income taxes																		1,079	1,367	3,399
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (Net of tax)																				666
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense (income)																		107	88	135
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (Net of tax)																		2,978	(6,789)	5,064
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Production costs	[3]																	$ 972	$ 1,279	$ 3,264

[1] The company does not report gross margin. This line item presents our material, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately) under an alternative presentation.

[2] As disclosed in Note 4, Financial Statement Revisions, the company reported cash receipts and payments for the repurchase and sale of territories and cash paid at issuance of notes receivable at net when these transactions should have been disaggregated. We concluded that the errors were not material to any of these prior periods that were impacted. The error resulted in an understatement of cash flows from operating activities and cash flows used in investing activities of $5.9 million, $12.1 million and $12.8 million, respectively, for the sixteen, twenty-eight, and forty-week amounts included in the first, second, and third quarters of fiscal 2017, respectively.  These amounts were revised upon subsequent presentation of these financial statements.

[3] Included in Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately).