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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

4 Months Ended

Apr. 20, 2019

Apr. 21, 2018

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in AOCI on Derivatives(Effective Portion)

^[1]

$ (9,593)

$ 10,470

Production costs

652,141

625,122

Income before income taxes

86,065

69,781

Reclassification out of Accumulated Other Comprehensive Income

Derivative Instruments, Gain (Loss) [Line Items]

Income before income taxes

^[2]

(2,178)

297

Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income

Derivative Instruments, Gain (Loss) [Line Items]

Interest expense

^[2]

33

33

Commodity Contract

Derivative Instruments, Gain (Loss) [Line Items]

Amount of Gain or (Loss) Recognized in AOCI on Derivatives(Effective Portion)

^[1]

(9,593)

10,470

Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income

Derivative Instruments, Gain (Loss) [Line Items]

Production costs

^[2],[3]

$ (2,211)

$ 264

[1]	Amounts in parentheses indicate debits to determine net income (loss).
[2]	Amounts in parentheses, if any, indicate credits to determine net income (loss).
[3]	Included in materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately).

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