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Concentrations Of Credit Risk (Narrative) (Details) - Customer Concentration Risk [Member] - customer | 12 Months Ended
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May 28, 2022 | May 29, 2021 | May 30, 2020
Revenue Benchmark [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of major customers | 0 | 0 | 0
Trade Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of major customers | 0 | 0 |

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- Definition Concentration Of Credit Risk, Number Of Customers + References No definition available. + Details
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Namespace Prefix: | rgp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_TradeAccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |