v3.25.2
Revenue Recognition and Related Costs - Disaggregation of Company's Net Revenue by Major Source (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]        
Net revenue $ 38,204,000 $ 40,676,000 $ 69,620,000 $ 66,694,000
Equipment Sales [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue 14,116,000 12,380,000 30,947,000 22,213,000
Equipment Sales [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue 12,121,000 17,394,000 19,709,000 24,575,000
Parts and Component Sales [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue 8,874,000 8,591,000 15,025,000 16,387,000
Freight Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue 2,588,000 1,762,000 3,333,000 2,897,000
Other [Member]        
Disaggregation of Revenue [Line Items]        
Net revenue $ 505,000 $ 549,000 $ 606,000 $ 622,000