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

The amount of liabilities of uncertain timing or the amount recognised when: (a) the entity has a present obligation (legal or constructive) as a result of a past event; (b) it is probable (ie more likely than not) that an outflow of resources embodying economic benefits will be required to settle the obligation; and (c) a reliable estimate can be made of the amount of the obligation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 54
-Subparagraph l
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_l&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_Provisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Description Of Inflation Rates Used In Current Estimate Of Value In Use

No definition available.

Name:	tga_DescriptionOfInflationRatesUsedInCurrentEstimateOfValueInUse
Namespace Prefix:	tga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Discount Rate Used In Current Estimate Of Value In Use For Provisions

No definition available.

Name:	tga_DiscountRateUsedInCurrentEstimateOfValueInUseForProvisions
Namespace Prefix:	tga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Provision, Undiscounted Liability

No definition available.