XML 124 R85.htm IDEA: XBRL DOCUMENT
v3.25.3

Long-term debt - Long-term debt (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 CAD ($) tranche | Sep. 30, 2025 USD ($) | Mar. 31, 2025 CAD ($) | Sep. 30, 2024 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 3,637,835,000 |  |  | $ 2,688,308,000
Current portion | 845,253,000 |  |  | 999,000
Long-term debt | 2,792,582,000 |  |  | 2,687,309,000
2021 U.S. Senior Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 1,386,564,000 |  |  | 1,342,758,000
Number of notes | tranche | 2 |  |  |
2021 U.S. Senior Notes | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | $ 1,000,000,000 |  |  |
Borrowings less financing fees | $ 1,393,100,000 |  |  |
2021 U.S. Senior Notes | Weighted average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, maturity term | 3 years |  |  |
Borrowings, interest rate | 1.79% | 1.79% |  |
2021 U.S. Senior Notes | Less than one year |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | $ 835,860,000 | $ 600,000 |  |
2021 U.S. Senior Notes | Beyond five years |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | 557,240,000 | $ 400,000 |  |
2021 CAD Senior Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 597,892,000 |  |  | 597,212,000
Borrowings, interest rate | 2.10% | 2.10% |  |
2021 CAD Senior Notes | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | $ 600,000,000 |  |  |
2021 CAD Senior Notes | Later than two years and not later than three years |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | 600,000,000 |  |  |
2024 CAD Senior Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 747,001,000 |  |  | 746,144,000
2024 CAD Senior Notes | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | $ 750,000,000 |  |  |
2024 CAD Senior Notes | Weighted average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 4.08% | 4.08% |  |
2024 CAD Senior Notes | Later than one year and not later than two years |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | $ 300,000,000 |  |  |
2024 CAD Senior Notes | Later than three years and not later than four years |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | 450,000,000 |  |  |
2025 U.S. Senior Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 894,509,000 |  |  | 0
2025 U.S. Senior Notes | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings less financing fees |  |  | $ 650,000,000 |
2025 U.S. Senior Notes | Weighted average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate |  |  | 4.95% |
2025 U.S. Senior Notes | Later than four years and not later than five years |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount of financial liabilities | 905,515,000 | $ 650,000 |  |
Other long-term debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 11,869,000 |  |  | $ 2,194,000

X
- Definition Borrowings Less Financing Fees + References No definition available. + Details
Name: | gib_BorrowingsLessFinancingFees
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Borrowings, Maturity Term + References No definition available. + Details
Name: | gib_BorrowingsMaturityTerm
Namespace Prefix: | gib_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Notional Amount Of Financial Liabilities + References No definition available. + Details
Name: | gib_NotionalAmountOfFinancialLiabilities
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number Of Notes + References No definition available. + Details
Name: | gib_NumberOfNotes
Namespace Prefix: | gib_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_CurrentPortionOfLongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_LongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=gib_A2021USUnsecuredSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=gib_A2021CADUnsecuredSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=gib_A2024CADUnsecuredSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=gib_A2025U.S.UnsecuredSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=gib_OtherLongTermBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |