Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 85,671	$ 78,319
Work in progress	19,489	15,654
Finished goods and products held for resale	63,493	56,435
Costs of unbilled projects	3,789	3,438
Reserves for excess and obsolete	(11,214)	(11,467)
Inventory, Net	$ 161,228	$ 142,379

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Amount, before valuation and last-in first out (LIFO) reserves, of costs capitalized in inventory classified as other, expected to be sold, or consumed within one year or operating cycle, if longer.

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