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Nature of Operations and Summary of Significant Accounting Policies - Disaggregation of Company's Net Revenue by Major Source (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]    
Net revenue $ 113,166,000 $ 105,075,000
Equipment Sales [Member] | Transferred over Time [Member]    
Disaggregation of Revenue [Line Items]    
Net revenue 45,786,000 34,150,000
Equipment Sales [Member] | Transferred at Point in Time [Member]    
Disaggregation of Revenue [Line Items]    
Net revenue 34,798,000 40,138,000
Parts and Component Sales [Member]    
Disaggregation of Revenue [Line Items]    
Net revenue 26,456,000 25,298,000
Freight Revenue [Member]    
Disaggregation of Revenue [Line Items]    
Net revenue 5,172,000 4,664,000
Other [Member]    
Disaggregation of Revenue [Line Items]    
Net revenue $ 954,000 $ 825,000