Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

SIGNIFICANT ACCOUNTING POLICIES (Details)

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SIGNIFICANT ACCOUNTING POLICIES (Details)
12 Months Ended
Oct. 12, 2015
Sep. 30, 2017
USD ($)
Sep. 30, 2017
HKD ($)
Sep. 30, 2017
CNY (¥)
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   68.90%    
Subsidiary One [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Name of the Entity   ZK International    
Subsidiary of Limited Liability Company or Limited Partnership, State   BVI    
Subsidiary of Limited Liability Company or Limited Partnership, Date   May 13, 2015    
Subsidiary of Limited Liability Company or Limited Partnership, Registered Capital   $ 50,000    
Subsidiary of Limited Liability Company or Limited Partnership, Business Purpose   A holding company with no operation activities itself for the years then ended    
Subsidiary One [Member] | HUANG Jian Cong [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest 45.00% 31.00%    
Subsidiary One [Member] | WANG Ming Jie [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest 20.00% 13.80%    
Subsidiary One [Member] | WANG Guo Lin [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest 20.00% 13.80%    
Subsidiary One [Member] | WANG Jian Di [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest 10.00% 6.90%    
Subsidiary One [Member] | WANG Yang Ming [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest 5.00% 3.40%    
Subsidiary Two [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Name of the Entity   ZK Pipe    
Subsidiary of Limited Liability Company or Limited Partnership, State   Hong Kong    
Subsidiary of Limited Liability Company or Limited Partnership, Date   May 28, 2015    
Subsidiary of Limited Liability Company or Limited Partnership, Registered Capital     $ 1,000,000  
Subsidiary of Limited Liability Company or Limited Partnership, Business Purpose   Have not commenced operations    
Subsidiary Two [Member] | ZK International [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest 100.00% 100.00%    
Subsidiary Three [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Name of the Entity   Wenzhou Weijia    
Subsidiary of Limited Liability Company or Limited Partnership, State   Wenzhou    
Subsidiary of Limited Liability Company or Limited Partnership, Date   Jun. 17, 2015    
Subsidiary of Limited Liability Company or Limited Partnership, Registered Capital   $ 20,000,000    
Subsidiary of Limited Liability Company or Limited Partnership, Business Purpose   Have not commenced operations    
Subsidiary Three [Member] | ZK Pipe [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   100.00%    
Subsidiary Four [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Name of the Entity   Zhejiang Zhengkang    
Subsidiary of Limited Liability Company or Limited Partnership, State   Wenzhou    
Subsidiary of Limited Liability Company or Limited Partnership, Date   Dec. 04, 2001    
Subsidiary of Limited Liability Company or Limited Partnership, Registered Capital | ¥       ¥ 30,000,000
Subsidiary of Limited Liability Company or Limited Partnership, Business Purpose   Principally operated in manufacturing and sales of steel strip, steel pipe and fittings    
Subsidiary Four [Member] | Wenzhou Weijia [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   99.00%    
Subsidiary Four [Member] | HUANG Jian Cong [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   1.00%    
Subsidiary Five [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Name of the Entity   Wenzhou Zhengfeng    
Subsidiary of Limited Liability Company or Limited Partnership, State   Wenzhou    
Subsidiary of Limited Liability Company or Limited Partnership, Date   Dec. 24, 1999    
Subsidiary of Limited Liability Company or Limited Partnership, Registered Capital | ¥       ¥ 2,880,000
Subsidiary of Limited Liability Company or Limited Partnership, Business Purpose   Principally operated in trading of steel strip, mainly purchased from Wenzhou Zhengkang    
Subsidiary Five [Member] | Zhejiang Zhengkang [Member]        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   100.00%