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v3.21.1

Subsequent Events - (Details) - USD ($) $ in Millions | Apr. 30, 2021 | Apr. 29, 2021 | Mar. 31, 2021
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Subsequent Event [Line Items] |  |  |
Number of shares authorized to be repurchased (in shares) |  |  | 1,500,000,000
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 500
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Additional shares authorized to be repurchased (in shares) |  | 500,000,000 |
Stock repurchase program, remaining authorized repurchase amount | $ 290 |  |

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- Definition Stock Repurchase Program, Additional Shares Authorized to Be Repurchased + References No definition available. + Details
Name: | it_StockRepurchaseProgramAdditionalSharesAuthorizedToBeRepurchased
Namespace Prefix: | it_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |