XML 108 R52.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Segment and Geographic Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Operating Segments [Abstract] |
Revenue by End Market as a Percentage of Total Revenue | The following table indicates revenue by end market as a percentage of total revenue for the periods indicated. Our revenue fluctuates from period-to-period depending on numerous factors, including but not limited to: the mix and complexity of the products or services we provide, the extent, timing and rate of new program wins, and the execution of our programs and services, follow-on business, program completions or losses, the phasing in or out of programs, the success in the marketplace of our customers’ products, changes in customer demand, and the seasonality of our business. We expect that the pace of technological change, the frequency of customers transferring business among EMS competitors, the level of outsourcing by customers (including decisions to insource), and the dynamics of the global economy will also continue to impact our business from period-to-period.
| Year ended December 31
| 2015 |  | 2016 |  | 2017
Advanced Technology Solutions (ATS) | 32 | % |  | 32 | % |  | 32 | %
Communications | 40 | % |  | 42 | % |  | 43 | %
Enterprise | 28 | % |  | 26 | % |  | 25 | %
Disclosure of Geographical Areas | The following table details our external revenue allocated by manufacturing location among countries that generated in excess of 10% of total revenue for the years indicated:
| Year ended December 31
| 2015 |  | 2016 |  | 2017
Thailand | 33 | % |  | 36 | % |  | 34 | %
China | 23 | % |  | 21 | % |  | 21 | %
Malaysia | 14 | % |  | 13 | % |  | 12 | %
The following table details our allocation of property, plant and equipment, intangible assets and goodwill among countries that exceeded 10% of total property, plant and equipment, intangible assets and goodwill for the years indicated:
| December 31
| 2016 |  | 2017
China | 23 | % |  | 22 | %
Thailand | 17 | % |  | 17 | %
Malaysia | 17 | % |  | 14 | %
Romania | * |  |  | 14 | %
United States | 13 | % |  | 12 | %
Canada | * |  |  | * |
* Less than 10% in 2016 and 2017.

X
- Definition Disclosure Of Detailed Information About Revenue By Customer Market Explanatory [Table Text Block] + References No definition available. + Details
Name: | cls_DisclosureOfDetailedInformationAboutRevenueByCustomerMarketExplanatoryTableTextBlock
Namespace Prefix: | cls_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Segments [Abstract] + References No definition available. + Details
Name: | cls_OperatingSegmentsAbstract
Namespace Prefix: | cls_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of geographical information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 33 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_33&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DisclosureOfGeographicalAreasExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration