Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.21.4
Summary of Significant Accounting Policies - Narrative (Details)
12 Months Ended
Sep. 30, 2021
USD ($)
mi
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Concentration Risk [Line Items]      
Contract liability $ 4,654,000 $ 3,973,000 $ 3,328,000
Customer credit, period 1 year    
Revenue recognized $ 2,858,000 1,754,000  
Local transport, price per seat 195    
Local transport with annual pass, price per seat 95    
Annual pass price 795    
Advertising costs 1,889,000 878,000 1,776,000
Prepaid marketing supplies 547,000 512,000  
Depreciation and amortization $ 353,000 $ 336,000 $ 289,000
Minimum      
Concentration Risk [Line Items]      
Number of miles | mi 60    
Commuter price per seat $ 595    
Maximum      
Concentration Risk [Line Items]      
Number of miles | mi 100    
Commuter price per seat $ 795    
Accounts Receivable | Customer Concentration Risk | Customer one      
Concentration Risk [Line Items]      
Concentration risk, percentage   36.00%  
Accounts Receivable | Customer Concentration Risk | Customer two      
Concentration Risk [Line Items]      
Concentration risk, percentage   29.00%  
Accounts Receivable | Customer Concentration Risk | Customer three      
Concentration Risk [Line Items]      
Concentration risk, percentage   10.00%  
Operating Expense | Supplier Concentration Risk | Vendor one      
Concentration Risk [Line Items]      
Concentration risk, percentage 12.00% 12.00% 15.00%
Operating Expense | Supplier Concentration Risk | Vendor two      
Concentration Risk [Line Items]      
Concentration risk, percentage 12.00%   15.00%
Operating Expense | Supplier Concentration Risk | Vendor three      
Concentration Risk [Line Items]      
Concentration risk, percentage     11.00%
Accounts Payable | Supplier Concentration Risk | Vendor one      
Concentration Risk [Line Items]      
Concentration risk, percentage 17.00% 26.00%  
Accounts Payable | Supplier Concentration Risk | Vendor two      
Concentration Risk [Line Items]      
Concentration risk, percentage 13.00%