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Related party transactions (Details) - Rental Company
12 Months Ended
Oct. 01, 2022
lease
Sep. 30, 2025
USD ($)
ft²
lease
Sep. 30, 2024
USD ($)
Related party transactions      
Number of leases   6  
Number of leases renewed 5    
Combined area | ft²   74,520  
Lease payments per month | $   $ 65,000 $ 63,000
Minimum percentage increase in lease rent   3.00%  
Lease expires in June 2026      
Related party transactions      
Number of leases   1  
Lease Expires in September 2029      
Related party transactions      
Number of leases   5