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SHAREHOLDERS' DEFICIT - Shares Issuance Program (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2024 | Mar. 31, 2023
Subsidiary, Sale of Stock [Line Items] |  |  |
Shares, issued (in shares) |  | 0 | 0
Shelf Registration |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of stock, authorized | $ 150,000,000 |  |
Prospectus Supplement |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of stock, authorized | 50,000,000 |  |
At-The-Market |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of stock, authorized | $ 50,000,000 |  |

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- Definition Sale Of Stock, Value Authorized In Transaction + References No definition available. + Details
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Namespace Prefix: | rgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 + Details
Name: | us-gaap_SharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=rgs_ShelfRegistrationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=rgs_ProspectusSupplementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=rgs_AtTheMarketOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |