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Restructuring, Impairment, and Other Exit Costs (Restructuring, Impairment Charges And Project-Related Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 26, 2023 | Nov. 27, 2022 | Nov. 26, 2023 | Nov. 27, 2022
Restructuring and Related Cost [Line Items] |  |  |  |
Restructuring charges | $ 131.9 | $ 11.6 | $ 141.7 | $ 13.9
Project-related costs classified in cost of sales | 0.3 | 0.0 | 1.1 | 0.0
Restructuring, Impairment and Other Exit Costs [Member] |  |  |  |
Restructuring and Related Cost [Line Items] |  |  |  |
Restructuring charges | 123.6 | 11.1 | 124.8 | 12.7
Cost of Sales [Member] |  |  |  |
Restructuring and Related Cost [Line Items] |  |  |  |
Restructuring charges | $ 8.3 | $ 0.5 | $ 16.9 | $ 1.2

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- Definition Other restructuring initiative project-related costs incurred during the reporting period that are not included in restructuring charges. + References No definition available. + Details
Name: | gis_OtherProjectRelatedCosts
Namespace Prefix: | gis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of restructuring charges (reduction) and asset impairment loss, including restructuring charges associated with cost of goods sold. + References No definition available. + Details
Name: | gis_RestructuringChargesReversalIncludingRestructuringChargesAssociatedWithCostOfGoodsSold
Namespace Prefix: | gis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedCostLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_RestructuringChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |