Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 749,977		$ 749,977		$ 698,173
Less: accumulated depreciation	(377,578)		(377,578)		(333,712)
Property, plant, and equipment, net	372,399		372,399		364,461
Depreciation and amortization	19,170	$ 18,992	56,450	$ 54,480
Maintenance and repair expense	4,603	$ 4,601	14,565	$ 15,915
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	386,458		386,458		357,650
Land and buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	70,591		70,591		70,245
Construction in process
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	53,975		53,975		48,325
Rental equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 238,953		$ 238,953		$ 221,953