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Revenue Recognition and Related Costs - Disaggregation of Company's Net Revenue by Major Source (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Net revenue $ 27,877,000 $ 29,647,000 $ 84,204,000 $ 80,407,000
Equipment Sales [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue 11,309,000 9,248,000 23,022,000 30,020,000
Equipment Sales [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue 9,012,000 13,729,000 37,105,000 28,402,000
Parts and Component Sales [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue 6,317,000 5,419,000 19,445,000 18,243,000
Freight Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue 1,141,000 972,000 4,141,000 3,050,000
Other [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue $ 98,000 $ 279,000 $ 491,000 $ 692,000