Share capital warrants and subscription receipts - Summary of Calculation of Weighted Average Number of Common Shares (Detail) - shares	12 Months Ended
Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2021
Earnings per share [line items]
Issued common shares as at December 1	24,201,582	23,780,417	19,253,360
Effect of share issue	2,053,928	1,286,695	817,766
Weighted average number of common shares, basic and diluted	26,332,429	23,813,344	23,087,557
ATM program [Member]
Earnings per share [line items]
Effect of share issue	0	29,589	0
Share options [member]
Earnings per share [line items]
Effect of share options exercised	0	3,338	93,562
public issue common shares [member]
Earnings per share [line items]
Effect of issue common shares	1,843,517	0	3,704,071
Brokers warrants [member]
Earnings per share [line items]
Effect of broker warrants exercised	0	0	36,564
Subscription Receipts Issue [Member]
Earnings per share [line items]
Effect of subscription receipts issue	287,223	0	0
Convertible Unsecured Senior Notes [member]
Earnings per share [line items]
Impact on conversion of convertible unsecured senior notes	107	0	0

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 2023-01-01
-Paragraph 70
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2023-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed conversion of the entity's convertible instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
-IssueDate 2023-01-01
-Paragraph 70
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2023-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

+ Details

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

- Definition

Effect of broker warrants exercised.

+ References

No definition available.

+ Details

Name:	thtx_EffectOfBrokerWarrantsExercised
Namespace Prefix:	thtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Effect of issue common shares.

+ References

No definition available.

+ Details

Name:	thtx_EffectOfIssueCommonShares
Namespace Prefix:	thtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Effect of share options exercised.

+ References

No definition available.

+ Details

Name:	thtx_EffectOfShareOptionsExercised
Namespace Prefix:	thtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Effect of share options on number of ordinary shares.

+ References

No definition available.

+ Details

Name:	thtx_EffectOfShareOptionsOnNumberOfOrdinaryShares
Namespace Prefix:	thtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Effect of subscription receipts issue.

+ References

No definition available.

+ Details

Name:	thtx_EffectOfSubscriptionReceiptsIssue
Namespace Prefix:	thtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	thtx_ProgramNameAxis=thtx_AtmProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfOrdinarySharesAxis=thtx_ShareOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfOrdinarySharesAxis=thtx_PublicIssueOfSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfOrdinarySharesAxis=thtx_BrokersWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfOrdinarySharesAxis=thtx_SubscriptionReceiptsIssueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfOrdinarySharesAxis=thtx_ConvertibleUnsecuredSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: