v3.10.0.1

Subsequent events (Details) - Subsequent Events [Member] | Jul. 31, 2018 $ / shares
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Disclosure of non-adjusting events after reporting period [line items] |
Dividend approved (in dollars per share) | $ 0.34
Dividend approved expected date to be paid | Sep. 15, 2018
Dividend approved record date | Aug. 31, 2018

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References No definition available. + Details
Name: | aby_DividendPayableDateToBePaidDayMonthAndYear1
Namespace Prefix: | aby_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | aby_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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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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- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_137_a&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=aby_SubsequentEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |