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Derivative Instruments - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Aug. 31, 2019 | Nov. 30, 2018
Derivative [Line Items] |  |
Existing net losses in accumulated other comprehensive loss expected to be reclassified to earnings | $ 13,021 |
Decrease in derivative asset and liability, offsetting | $ 6,998 | $ 6,850
Maximum | Foreign Exchange Forward Contracts | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Foreign exchange forward contracts, maturity | 12 months |
Maximum | Cash Flow Hedging | Foreign Exchange Forward Contracts |  |
Derivative [Line Items] |  |
Derivative maturity date | 2021-09 |
Maximum | Cash Flow Hedging | Interest Rate Swap |  |
Derivative [Line Items] |  |
Derivative maturity date | Oct. 31, 2023 |

X
- Definition Decrease in derivative assets and liability if amounts were offset under a master netting agreement. + References No definition available. + Details
Name: | snx_DecreaseInDerivativeAssetsAndLiabilityDueToOffsetting
Namespace Prefix: | snx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative maturity date in month and year. + References No definition available. + Details
Name: | snx_DerivativeMaturityDateInMonthAndYear
Namespace Prefix: | snx_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
Name: | us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |