Share-Based Compensation Plan - Additional Information (Details)	12 Months Ended
Dec. 31, 2024 CAD ($) share $ / shares	Dec. 31, 2023 CAD ($) $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Compensation expense related to share awards	$ 17,872,000	$ 37,699,000
Closing share price (in dollars per share) \| $ / shares	$ 3.70	$ 4.38
Maximum percentage of issuable awards to outstanding common stock	3.80%
Minimum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Payout multiplier	0.00%
Maximum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Payout multiplier	200.00%
Incentive Award Plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average fair value of share awards (in cad per share)	$ 4.34	$ 5.35
Deferred Share Unit Plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average fair value of share awards (in cad per share)	$ 4.46	5.15
Restricted awards
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of common shares entitled by restricted award \| share	1
Weighted average fair value of share awards (in cad per share)	$ 4.24	$ 5.40
Performance awards \| Minimum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of common shares entitled by restricted award \| share	0
Performance awards \| Maximum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of common shares entitled by restricted award \| share	2

Closing Share Price

No definition available.

Name:	bte_ClosingSharePrice
Namespace Prefix:	bte_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets, Cash And Equity Settled

+ References

No definition available.

+ Details

Name:	bte_ExpenseFromShareBasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssetsCashAndEquitySettled
Namespace Prefix:	bte_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number Of Common Shares Entitled By Share-Based Payment Arrangement

+ References

No definition available.

+ Details

Name:	bte_NumberOfCommonSharesEntitledByShareBasedPaymentArrangement
Namespace Prefix:	bte_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Other Equity Instruments Outstanding In Share-Based Payment Arrangement, Multiplier

+ References

No definition available.

+ Details

Name:	bte_OtherEquityInstrumentsOutstandingInShareBasedPaymentArrangementMultiplier
Namespace Prefix:	bte_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Maximum Percentage Of Issuable Share Awards Issued To Outstanding Shares

+ References

No definition available.

+ Details

Name:	bte_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumPercentageOfIssuableShareAwardsIssuedToOutstandingShares
Namespace Prefix:	bte_
Data Type:	dtr-types1:percentItemType
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_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2024-03-27

+ Details

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

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bte_PlanNameAxis=bte_IncentiveAwardPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bte_PlanNameAxis=bte_DeferredShareUnitPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=bte_RestrictedShareUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=bte_PerformanceShareUnitsPSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: