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Subsequent Event (Details) $ in Millions | Jun. 30, 2018 USD ($)
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Forecast | Atrenne |
Disclosure of non-adjusting events after reporting period [line items] |
Consideration transferred | $ 139

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- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=cls_AtrenneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |