Inventories - Additional Information (Detail) - USD ($)	9 Months Ended
	Jun. 30, 2024	Sep. 30, 2023
Inventory [Line Items]
Slow moving and obsolete inventory reserve	$ 11,622,000	$ 9,813,000
Three to Four Years Old Inventory [Member]
Inventory [Line Items]
Cost basis reduction in inventory, percentage	50.00%
Inventory, minimum time period on the shelf, years	3 years
Inventory, maximum time period on the shelf, years	4 years
Four to Five Years Old Inventory [Member]
Inventory [Line Items]
Cost basis reduction in inventory, percentage	75.00%
Inventory, minimum time period on the shelf, years	4 years
Inventory, maximum time period on the shelf, years	5 years
Greater Than Five Years Old Inventory [Member]
Inventory [Line Items]
Inventory, minimum time period on the shelf, years	5 years
Inventory valuation estimate	$ 0