Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Line Items]
Charity care	$ 7	$ 0
Accounts receivable written off period, maximum	120 days
Depreciation method	Depreciation is recognized over the estimated useful lives of the assets, which range from 3 to 45 years, on a straight-line basis.
Description of property, plant and equipment, estimated useful lives	Estimated useful lives of the assets, which range from 3 to 45 years, on a straight-line basis.
Depreciation	$ 1,741	1,845
Share-based compensation	$ 8	$ 64
Machinery and Equipment [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	10 years
Medical Equipment [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	3 years
Healthcare Services Segment [Member] \| Medicare [Member] \| Credit Concentration Risk [Member] \| Sales Revenue, Segment [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	43.00%	40.00%
Healthcare Services Segment [Member] \| Medicare [Member] \| Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	45.00%	53.00%
Healthcare Services Segment [Member] \| Medicaid [Member] \| Credit Concentration Risk [Member] \| Sales Revenue, Segment [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	40.00%	43.00%
Healthcare Services Segment [Member] \| Medicaid [Member] \| Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	36.00%	24.00%
Pharmacy Segment [Member] \| Medicare [Member] \| Credit Concentration Risk [Member] \| Sales Revenue, Segment [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	35.00%	35.00%
Pharmacy Segment [Member] \| Medicare [Member] \| Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	19.00%	19.00%
Pharmacy Segment [Member] \| Medicaid [Member] \| Credit Concentration Risk [Member] \| Sales Revenue, Segment [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	26.00%	23.00%
Pharmacy Segment [Member] \| Medicaid [Member] \| Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	18.00%	19.00%
Pharmacy Segment [Member] \| Private Insurance and Institutional Customers [Member] \| Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Accounting Policies [Line Items]
Concentrations of Credit Risk	63.00%	62.00%
Minimum [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	3 years
Definite-life intangible assets, estimated useful lives	2 years
Minimum [Member] \| Furniture and Fixtures [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	5 years
Minimum [Member] \| Buildings [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	25 years
Minimum [Member] \| Leasehold Improvements and Leased Machinery and Equipment [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	5 years
Maximum [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	45 years
Definite-life intangible assets, estimated useful lives	30 years
Maximum [Member] \| Furniture and Fixtures [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	10 years
Maximum [Member] \| Buildings [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	45 years
Maximum [Member] \| Leasehold Improvements and Leased Machinery and Equipment [Member]
Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	15 years

Accounting Policies [Line Items]

No definition available.

Name:	ssy_AccountingPoliciesLineItems
Namespace Prefix:	ssy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum period of accounts receivable written off.

+ References

No definition available.

+ Details

Name:	ssy_MaximumPeriodOfAccountsReceivableWrittenOff
Namespace Prefix:	ssy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of subsidies received by the entity for providing charity care, for example, from an uncompensated care fund.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 605
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=68052803&loc=d3e8255-115641

+ Details

Name:	us-gaap_CharityCareReimbursementsReceived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the methodology for computing depreciation for classes of depreciable assets.

+ References

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentDepreciationMethods
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=ssy_MedicalEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ssy_HealthcareServicesSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HealthCareOrganizationRevenueSourcesAxis=ssy_MedicareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CreditConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HealthCareOrganizationRevenueSourcesAxis=ssy_MedicaidMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ssy_PharmacySegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HealthCareOrganizationRevenueSourcesAxis=ssy_PrivateInsuranceAndInstitutionalCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdsAndLeaseholdImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: