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Stock Plans (Schedule of compensation expense related to stock-based payments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 27, 2022 | Nov. 28, 2021 | Nov. 27, 2022 | Nov. 28, 2021
Stock Plans [Abstract] |  |  |  |
Compensation expense related to stock-based payments | $ 24.1 | $ 13.9 | $ 57.6 | $ 47.5

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees, including any applicable restructuring items and non-cash items. + References No definition available. + Details
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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_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration