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v3.22.2

Subsequent Events (Details) - Third Amendment to Credit Agreement - Line of Credit - USD ($) $ in Millions | Jul. 22, 2022 | Jun. 30, 2022
--- | --- | ---
Subsequent Event [Line Items] |  |
Credit facility, borrowing capacity |  | $ 1,200
Line of credit facility, available increase in maximum borrowing capacity |  | $ 500
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Credit facility, borrowing capacity | $ 1,800 |
Line of credit facility, available increase in maximum borrowing capacity | 750 |
Revolving Credit Facility | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Credit facility, borrowing capacity | $ 100 |

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- Definition Line of Credit Facility, Maximum Requested Borrowing Capacity Increase + References No definition available. + Details
Name: | nsit_LineOfCreditFacilityMaximumRequestedBorrowingCapacityIncrease
Namespace Prefix: | nsit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=nsit_ThirdAmendmentToCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |