BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Self-Insurance Accruals (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Decrease in self-insurance expense	$ 0.8	$ 0.8	$ 0.9
Self-insurance accruals, current	1.0	1.2
Self-insurance accruals, noncurrent	$ 2.8	$ 3.5

Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, arising from workmen's compensation-type of incidents that are expected to be paid after one year (or the normal operating cycle, if longer).

No definition available.

Name:	rgs_SelfInsuranceReserveWorkersCompensationNoncurrent
Namespace Prefix:	rgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant