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SHAREHOLDERS' DEFICIT - Shares Issuance Program (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2021
Subsidiary, Sale of Stock [Line Items] |  |
Shares, issued (in shares) | 0 |
Remaining shares (in shares) | 16,500,000 |
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
Remaining value | $ 11,600,000 |
At-The-Market |  |
Subsidiary, Sale of Stock [Line Items] |  |
Sale of stock, authorized |  | $ 50,000,000

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- Definition Sale Of Stock, Shares, Remaining + References No definition available. + Details
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Namespace Prefix: | rgs_
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Balance Type: | na
Period Type: | duration

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

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- Definition Sale Of Stock, Value, Remaining + References No definition available. + Details
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Namespace Prefix: | rgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
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Balance Type: | na
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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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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |