BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	Jun. 30, 2012
Express Test Corporation (Dormant)
Ownership	100.00%
Location	Van Nuys, California
Trio-Tech Reliability Services (Dormant)
Ownership	100.00%
Location	Van Nuys, California
KTS Incorporated, dba Universal Systems (Dormant)
Ownership	100.00%
Location	Van Nuys, California
European Electronic Test Centre (Operation ceased on November 1, 2005)
Ownership	100.00%
Location	Dublin, Ireland
Trio-Tech International Pte. Ltd
Ownership	100.00%
Location	Singapore
Universal (Far East) Pte. Ltd
Ownership	100.00%
Location	Singapore
Trio-Tech International (Thailand) Co. Ltd
Ownership	100.00%
Location	Bangkok, Thailand
Trio-Tech (Bangkok) Co. Ltd. (49% owned by Trio-Tech International Pte. Ltd. and 51% owned by Trio-Tech International (Thailand) Co. Ltd.)
Ownership	100.00%
Location	Bangkok, Thailand
Trio-Tech (Malaysia) Sdn. Bhd. (55% owned by Trio-Tech International Pte. Ltd.)
Ownership	55.00%
Location	Penang and Selangor, Malaysia
Trio-Tech (Kuala Lumpur) Sdn. Bhd. (100% owned by Trio-Tech Malaysia Sdn. Bhd.)
Ownership	55.00%
Location	Selangor, Malaysia
Prestal Enterprise Sdn. Bhd. (76% owned by Trio-Tech International Pte. Ltd.)
Ownership	76.00%
Location	Selangor, Malaysia
Trio-Tech (Suzhou) Co. Ltd.
Ownership	100.00%
Location	Suzhou, China
Trio-Tech (Shanghai) Co. Ltd.
Ownership	100.00%
Location	Shanghai, China
Trio-Tech (Chongqing) Co. Ltd. SHI International Pte. Ltd.
Ownership	100.00%
Location	Chongqing, China
SHI International Pte. Ltd. (55% owned by Trio-Tech International Pte. Ltd.)
Ownership	55.00%
Location	Singapore
PT SHI Indonesia (100% owned by SHI International Pte. Ltd)
Ownership	55.00%
Location	Batam, Indonesia
Trio-Tech (Tianjin) Co. Ltd.
Ownership	100.00%
Location	Tianjin, China