Name:	exfo_AntidilutiveSecuritiesExcludedFromCalculationOfDilutedWeightedAverageNumberOfSharesOutstanding
Namespace Prefix:	exfo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	exfo_DilutiveEffectAbstract
Namespace Prefix:	exfo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The number of dilutive potential ordinary shares that relate to the assumed deferred shares units of the entity's deferred shares units.

No definition available.

Name:	exfo_DilutiveEffectOfDeferredShareUnitsOnNumberOfOrdinaryShares
Namespace Prefix:	exfo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The number of dilutive potential ordinary shares that relate to the assumed restricted shares units of the entity's restricted shares units.

No definition available.

Name:	exfo_DilutiveEffectOfRestrictedSharesUnitsOnNumberOfOrdinaryShares
Namespace Prefix:	exfo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 33
-IssueDate 2019-01-01
-Paragraph 70
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_AdjustedWeightedAverageShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	ifrs-full_EarningsPerShareAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.