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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Net revenue	$ 29,647,000	$ 24,919,000	$ 80,407,000	$ 65,235,000
Equipment Sales [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Net revenue	9,248,000	6,507,000	30,020,000	14,509,000
Equipment Sales [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net revenue	13,729,000	12,258,000	28,402,000	31,959,000
Parts and Component Sales [Member]
Disaggregation of Revenue [Line Items]
Net revenue	5,419,000	5,240,000	18,243,000	16,001,000
Freight Revenue [Member]
Disaggregation of Revenue [Line Items]
Net revenue	972,000	996,000	3,050,000	2,888,000
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 279,000	$ (82,000)	$ 692,000	$ (122,000)

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