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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Additions made to capitalized computer software costs during the period.

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The cash outflow associated with the development or modification of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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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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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended			48 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2018
PROPERTY, PLANT AND EQUIPMENT
Accumulated depreciation and amortization	$ (144,782)	$ (127,530)		$ (144,782)
Property, plant and equipment - net	117,546	113,220		117,546
Development expense	52,398	52,652	$ 31,976
Depreciation of plant and equipment and amortization of leasehold improvements	19,500	17,800	11,000
Land and land improvements
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	13,132	16,139		13,132
Buildings and improvements
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	$ 57,959	52,625		57,959
Buildings and improvements \| Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	P15Y
Buildings and improvements \| Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	P39Y
Machinery and other equipment
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	$ 81,727	73,235		81,727
Machinery and other equipment \| Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	P5Y
Machinery and other equipment \| Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	P10Y
Software
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	$ 84,631	62,297		84,631
Costs related to the purchase and development of software	22,500	40,600	45,200	135,800
Addition to capitalized software expenses	7,500	16,700	20,300
Development expense	$ 15,000	23,900	$ 24,900
Software \| Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	P3Y
Software \| Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	P7Y
Leasehold improvements
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	$ 11,991	13,298		11,991
Construction and internal-use software development in progress
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	$ 12,888	$ 23,156		$ 12,888