Revenue Recognition and Accounts Receivables - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Receivables [Abstract]
Net revenues for settlements and filings of prior year Medicare and Medicaid cost reports	$ 112	$ 193

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