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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. 29, 2018 USD ($) | Dec. 29, 2018 ZAR (R) | Dec. 30, 2017 USD ($) | Dec. 30, 2017 ZAR (R)
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Derivative [Line Items] |  |  |  |
Fair value of designated forward contracts | $ | $ 1.2 |  | $ 2.9 |
Hedged amount | R |  | R 17.5 |  | R 39.8

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- Definition Amount of hedged item in hedging relationship. Excludes hedged asset or liability. + References No definition available. + Details
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- 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=109250915&loc=d3e13433-108611 + Details
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