Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted	0	0
Share options exercised, Shares	195,000	30,000
Options outstanding	185,000	380,000	410,000
Share-based compensation, amount recognized	$ 0	$ 0
Unrecognized compensation cost	0	0
Aggregate intrinsic value of options outstanding	$ 3	$ 3
2005 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan, Description	The 2005 Equity Incentive Plan approved by SunLink’s shareholders on November 7, 2005 permitted the grant of options to employees, non-employee directors and service providers of SunLink for the purchase of up to 800,000 common shares plus the number of unused shares under its 2001 Plans, which were 30,675.
Options granted	0	0
Share options exercised, Shares	0
Options outstanding	90,000
Shares available for grants	0
Maximum [Member] | 2005 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common shares	800,000
2011 Director Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan, Description	The 2011 Director Stock Option Plan was approved by SunLink’s shareholders at the Annual Meeting of Shareholders on November 7, 2011.
Options granted	0	0
Share options exercised, Shares	105,000	30,000
Options outstanding	95,000
Shares available for grants	0
2011 Director Stock Option Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common shares	300,000
2001 Plans [Member] | 2005 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share options exercised, Shares	90,000
Number of shares restricted under share based plan	30,675