Inventories - Additional Information (Detail) - USD ($) |
6 Months Ended | ||
---|---|---|---|
Mar. 31, 2025 |
Sep. 30, 2024 |
Mar. 31, 2024 |
|
Inventory [Line Items] | |||
Slow moving and obsolete inventory reserve | $ 14,250,000 | $ 13,331,000 | $ 1,293,000 |
Inventory, LIFO reserve, period charge | $ 919,000 | ||
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 |