XML 147 R105.htm IDEA: XBRL DOCUMENT
v3.23.3

Capital stock - Schedule of outstanding shares (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2023 shares | Sep. 30, 2023 CAD ($) shares | Sep. 30, 2022 CAD ($) shares
Reconciliation of number of shares outstanding [abstract] |  |  |
Equity at beginning of period |  | $ 7,272,724,000 | $ 6,986,232,000
Release of shares held in trusts |  | (13,879,000) | 0
Purchased and held in trust |  | $ (74,455,000) | $ (70,303,000)
Issued upon exercise of stock options (in shares) | shares |  | 1,646,044 | 941,059
Issued upon exercise of stock options |  | $ 88,316,000 | $ 41,687,000
Equity at end of period |  | 8,310,294,000 | 7,272,724,000
Withholding taxes remitted on the net settlement of performance share units |  | 13,879,000 | 0
Purchase and cancellation of Class A subordinate voting shares |  | $ 788,020,000 | $ 913,388,000
Capital stock |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Beginning balance (in shares) | shares |  | 237,748,255,000 | 245,617,035,000
Equity at beginning of period |  | $ 1,493,169,000 | $ 1,632,705,000
Release of shares held in trusts (in shares) | shares |  | 0 | 0
Release of shares held in trusts |  | $ 13,680,000 | $ 15,821,000
Purchased and held in trust (in shares) | shares |  | 0 | 0
Purchased and held in trust |  | $ (74,455,000) | $ (70,303,000)
Issued upon exercise of stock options (in shares) | shares |  | 1,646,044,000 | 941,059,000
Issued upon exercise of stock options |  | $ 106,051,000 | $ 50,236,000
Purchased and cancelled (in shares) | shares |  | (6,234,096,000) | (8,809,839,000)
Purchased and cancelled |  | $ (61,265,000) | $ (134,409,000)
Purchased and not cancelled (in shares) | shares |  |  | 0
Purchased and not cancelled |  |  | $ (881,000)
Ending balance (in shares) | shares |  | 233,160,203,000 | 237,748,255,000
Equity at end of period |  | $ 1,477,180,000 | $ 1,493,169,000
Capital stock | Class A subordinate voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Beginning balance (in shares) | shares |  | 211,302,549,000 | 219,171,329,000
Equity at beginning of period |  | $ 1,456,275,000 | $ 1,595,811,000
Release of shares held in trusts (in shares) | shares |  | 0 | 0
Release of shares held in trusts |  | $ 13,680,000 | $ 15,821,000
Purchased and held in trust (in shares) | shares |  | 0 | 0
Purchased and held in trust |  | $ (74,455,000) | $ (70,303,000)
Issued upon exercise of stock options (in shares) | shares |  | 1,646,044,000 | 941,059,000
Issued upon exercise of stock options |  | $ 106,051,000 | $ 50,236,000
Purchased and cancelled (in shares) | shares |  | (6,234,096,000) | (8,809,839,000)
Purchased and cancelled |  | $ (61,265,000) | $ (134,409,000)
Purchased and not cancelled (in shares) | shares |  |  | 0
Purchased and not cancelled |  |  | $ (881,000)
Ending balance (in shares) | shares |  | 206,714,497,000 | 211,302,549,000
Equity at end of period |  | $ 1,440,286,000 | $ 1,456,275,000
Shares purchased (in shares) | shares |  | 640,052 | 643,629
Capital stock | Class A subordinate voting shares | Major ordinary share transactions |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Number of treasury shares purchased and cancelled, after the reporting period (in shares) | shares |  | 68,550 |
Purchase and cancellation of treasury shares, after the reporting period |  | $ 558,000 |
Payments to acquire or redeem entity's shares and cancellation, after the reporting period |  | $ 9,177,000 |
Capital stock | Class B multiple voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Beginning balance (in shares) | shares |  | 26,445,706,000 | 26,445,706,000
Equity at beginning of period |  | $ 36,894,000 | $ 36,894,000
Release of shares held in trusts (in shares) | shares |  | 0 | 0
Release of shares held in trusts |  | $ 0 | $ 0
Purchased and held in trust (in shares) | shares |  | 0 | 0
Purchased and held in trust |  | $ 0 | $ 0
Issued upon exercise of stock options (in shares) | shares |  | 0 | 0
Issued upon exercise of stock options |  | $ 0 | $ 0
Purchased and cancelled (in shares) | shares |  | 0 | 0
Purchased and cancelled |  | $ 0 | $ 0
Purchased and not cancelled (in shares) | shares |  |  | 0
Purchased and not cancelled |  |  | $ 0
Ending balance (in shares) | shares |  | 26,445,706,000 | 26,445,706,000
Equity at end of period |  | $ 36,894,000 | $ 36,894,000
Contributed surplus |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Equity at beginning of period |  | 314,804,000 | 289,718,000
Release of shares held in trusts |  | (24,674,000) | (15,821,000)
Issued upon exercise of stock options |  | (17,735,000) | (8,549,000)
Equity at end of period |  | 345,032,000 | 314,804,000
Contributed surplus | Class A subordinate voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Issued upon exercise of stock options |  | 17,735,000 | 8,549,000
Retained earnings |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Equity at beginning of period |  | 5,425,005,000 | 4,732,229,000
Release of shares held in trusts |  | (2,885,000) |
Equity at end of period |  | $ 6,329,107,000 | $ 5,425,005,000
PSUs |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Release of shares held in trusts (in shares) | shares |  | 294,203 | 237,294
PSUs | Capital stock |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Release of shares held in trusts (in shares) | shares |  | 172,018 | 235,441
PSUs | Capital stock | Class A subordinate voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Shares outstanding, held in trust (in shares) | shares |  | 2,309,743 | 1,841,709
Normal Course Issuer Bid | Capital stock | Class A subordinate voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Purchased and cancelled (in shares) | shares |  | (2,857,550) | (3,866,171)
Purchased and cancelled |  | $ (386,906,000) | $ (408,656,000)
Number of shares authorized for purchase and cancellation (in shares) | shares | 18,769,394 |  |
Normal Course Issuer Bid | Retained earnings | Class A subordinate voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Purchased and cancelled |  | $ (363,747,000) | $ (378,340,000)
Normal Course Issuer Bid - Caisse de depot | Capital stock | Class A subordinate voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Purchased and cancelled (in shares) | shares |  | (3,344,996) | (4,907,073)
Purchased and cancelled |  | $ (400,000,000) | $ (500,000,000)
Normal Course Issuer Bid - Caisse de depot | Retained earnings | Class A subordinate voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Purchased and cancelled |  | $ (361,791,000) | $ (395,026,000)
Previous Normal Course Issuer Bid | Capital stock | Class A subordinate voting shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Purchased and cancelled (in shares) | shares |  | (100,100) |
Purchased and cancelled |  | $ (778,000) |
Purchase and cancellation of Class A subordinate voting shares |  | $ 10,291,000 |

X
- Definition Increase (Decrease) Through Exercise Of Other Equity Instruments, Equity + References No definition available. + Details
Name: | gib_IncreaseDecreaseThroughExerciseOfOtherEquityInstrumentsEquity
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number Of Other Equity Instruments Outstanding In Share-based Payment Arrangement, Held In Trust + References No definition available. + Details
Name: | gib_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangementHeldInTrust
Namespace Prefix: | gib_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Shares Authorised For Purchase And Cancellation + References No definition available. + Details
Name: | gib_NumberOfSharesAuthorisedForPurchaseAndCancellation
Namespace Prefix: | gib_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Shares Purchased + References No definition available. + Details
Name: | gib_NumberOfSharesPurchased
Namespace Prefix: | gib_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Shares Purchased, Held In Trust + References No definition available. + Details
Name: | gib_NumberOfSharesPurchasedHeldInTrust
Namespace Prefix: | gib_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Treasury Shares Purchased And Cancelled + References No definition available. + Details
Name: | gib_NumberOfTreasurySharesPurchasedAndCancelled
Namespace Prefix: | gib_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Treasury Shares Purchased And Cancelled, After The Reporting Period + References No definition available. + Details
Name: | gib_NumberOfTreasurySharesPurchasedAndCancelledAfterTheReportingPeriod
Namespace Prefix: | gib_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Treasury Shares Purchased And Not Cancelled + References No definition available. + Details
Name: | gib_NumberOfTreasurySharesPurchasedAndNotCancelled
Namespace Prefix: | gib_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payments To Acquire Or Redeem Entity's Shares And Cancellation + References No definition available. + Details
Name: | gib_PaymentsToAcquireOrRedeemEntitysSharesAndCancellation
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments To Acquire Or Redeem Entity's Shares And Cancellation, After The Reporting Period + References No definition available. + Details
Name: | gib_PaymentsToAcquireOrRedeemEntitysSharesAndCancellationAfterTheReportingPeriod
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Purchase And Cancellation Of Treasury Shares + References No definition available. + Details
Name: | gib_PurchaseAndCancellationOfTreasuryShares
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Purchase And Cancellation Of Treasury Shares, After The Reporting Period + References No definition available. + Details
Name: | gib_PurchaseAndCancellationOfTreasurySharesAfterTheReportingPeriod
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Purchase Of Treasury Shares Not Cancelled + References No definition available. + Details
Name: | gib_PurchaseOfTreasurySharesNotCancelled
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Withholding Taxes Paid Refunded Classified As Financing Activities + References No definition available. + Details
Name: | gib_WithholdingTaxesPaidRefundedClassifiedAsFinancingActivities
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of residual interest in the assets of the entity after deducting all its liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2023-01-01 -Paragraph 24 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2023-en-r&anchor=para_24_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2023-01-01 -Paragraph 32 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2023-en-r&anchor=para_32_a_i&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_a&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_b&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_e&doctype=Standard -URIDate 2023-03-23 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_e&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_Equity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in equity resulting from the exercise of options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_IncreaseDecreaseThroughExerciseOfOptions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NumberOfSharesOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_PurchaseOfTreasuryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_IssuedCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=gib_ClassASubordinateVotingSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_MajorOrdinaryShareTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=gib_ClassBMultipleVotingSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_AdditionalPaidinCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=gib_PerformanceShareUnitsPSUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gib_ShareRepurchaseProgram1Axis=gib_NormalCourseIssuerBidMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gib_ShareRepurchaseProgram1Axis=gib_NormalCourseIssuerBidCaisseDeDepotMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gib_ShareRepurchaseProgram1Axis=gib_PreviousNormalCourseIssuerBidMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |