Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 86,604	$ 75,223
Work in progress	19,544	14,741
Finished goods and products held for resale	62,380	58,223
Costs of unbilled projects	4,553	2,347
Reserves for excess and obsolete	(13,635)	(13,370)
Inventory, Net	$ 159,446	$ 137,164

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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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