Revenue - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Net revenues for positive settlements and filings of prior year Medicare and Medicaid cost reports	$ 0	$ 0

Health care organization significant change in estimates.

No definition available.

Name:	ssy_HealthCareOrganizationSignificantChangeInEstimates
Namespace Prefix:	ssy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration