Biological Assets And Inventory - Schedule of Estimates of Significant Inputs Related to Biological Assets and Inventory (Parenthetical) (Detail) - wk	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets [Line Items]
Average number of weeks	6	7
Stage of growth [member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets [Line Items]
Average number of weeks	16

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

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Balance Type:	na
Period Type:	duration