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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 736,165		$ 736,165		$ 698,173
Less: accumulated depreciation	(364,297)		(364,297)		(333,712)
Property, plant, and equipment, net	371,868		371,868		364,461
Depreciation and amortization	18,769	$ 18,185	37,280	$ 35,488
Maintenance and repair expense	4,754	$ 5,249	9,962	$ 11,314
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	376,831		376,831		357,650
Land and buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	69,541		69,541		70,245
Construction in process
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	53,324		53,324		48,325
Rental equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 236,469		$ 236,469		$ 221,953