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

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 147
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_147_b&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 148
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_148_d_iii&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 211
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_211_b&doctype=Standard
-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 211
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_211_b&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_EstimateOfContributionsExpectedToBePaidToPlan
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 53
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_53&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 203
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_203&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 203
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_203&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 147
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_147_c&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_WeightedAverageDurationOfDefinedBenefitObligation2019
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Benefit Expense, Defined Contribution Plan, Salary Requirement

No definition available.

Name:	snre_BenefitExpenseDefinedContributionPlanSalaryRequirement
Namespace Prefix:	snre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Defined Contribution Plan, Active Participants

No definition available.

Name:	snre_DefinedContributionPlanActiveParticipants
Namespace Prefix:	snre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Defined Contribution Plan, Participants Receiving Benefits

No definition available.

Name:	snre_DefinedContributionPlanParticipantsReceivingBenefits
Namespace Prefix:	snre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Strategic Investment Funds, Percentage Contributed To Fair Value Of Plan Assets, Bonds

No definition available.

Name:	snre_StrategicInvestmentFundsPercentageContributedToFairValueOfPlanAssetsBonds
Namespace Prefix:	snre_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Strategic Investment Funds, Percentage Contributed To Fair Value Of Plan Assets, Cash In Banks

No definition available.

Name:	snre_StrategicInvestmentFundsPercentageContributedToFairValueOfPlanAssetsCashInBanks
Namespace Prefix:	snre_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Strategic Investment Funds, Percentage Contributed To Fair Value Of Plan Assets, Equity Securities

No definition available.

Name:	snre_StrategicInvestmentFundsPercentageContributedToFairValueOfPlanAssetsEquitySecurities
Namespace Prefix:	snre_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Strategic Investment Funds, Percentage Contributed To Fair Value Of Plan Assets, Other

No definition available.

Name:	snre_StrategicInvestmentFundsPercentageContributedToFairValueOfPlanAssetsOther
Namespace Prefix:	snre_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Strategic Investment Funds, Percentage Contributed To Fair Value Of Plan Assets, Real Estate

No definition available.