Revenue Recognition and Accounts Receivables - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Receivables [Abstract]
Net revenues for settlements and filings of prior year Medicare cost reports	$ 38	$ 140	$ 385	$ (662)

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