v3.26.1
Nature of business and organization (Tables)
6 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of consolidated major subsidiaries
       
Name   Background   Ownership
Shan You International Group Limited   · A Hong Kong company
· Incorporated on March 22, 2023
· A holding company
  100% owned by WF
Sichuan Shanyou Zhiyuan Business Information Consulting Co., Ltd.  

· A PRC limited liability company
· Incorporated on April 28, 2023
· Registered capital of RMB1,000,000 (approximately $0.2 million)

· A holding company

  100% owned by Shanyou HK
Chengdu Shanyou HVAC Engineering Co., Ltd.   · A PRC limited liability company
· Incorporated on June 3, 2009
· Registered capital of RMB12,000,000 (approximately $1.9 million)
· Supply, installation, fitting-out and maintenance services for HVAC systems, fresh air ventilation systems, floor heating systems and water purification systems
  100% owned by WFOE
WF International Nevada LLC (“WF Nevada”)  

· A US limited liability company

· Incorporated on December 27, 2023

· A holding company

  100% owned by WF

Chengdu Wufang Boyuan Innovation Technology Co., Ltd.

(“Wufang Boyuan”)

  · A PRC limited liability company
· Incorporated on April 25, 2025
· Registered capital of RMB50,000,000 (approximately $6.9 million)
· A holding company
  100% owned by WF Nevada