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Derivatives and Risk Management (Non-designated Hedges) (Details) - Not designated as hedging instruments - Forward contracts R in Millions, $ in Millions	Dec. 28, 2019 USD ($)	Dec. 28, 2019 ZAR (R)	Dec. 29, 2018 USD ($)	Dec. 29, 2018 ZAR (R)
Derivative [Line Items]
Fair value of designated forward contracts | $	$ 1.5		$ 1.2
Hedged amount | R		R 22.6		R 17.5

X

- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Details

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- Details

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