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Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 500	$ 500	$ 500	$ 500	$ 500	$ 600	$ 600	$ 700	$ 6,126	$ 6,594	$ 12,709
Gross Carrying Amount	113,807				110,987				113,807	110,987
Accumulated Amortization	(99,668)				(96,451)				(99,668)	(96,451)
Total	14,139				14,536				14,139	14,536
Completed technology
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets									1,974	2,380	6,511
Gross Carrying Amount	82,724				82,295				82,724	82,295
Accumulated Amortization	(77,331)				(77,400)				(77,331)	(77,400)
Total	5,393				4,895				$ 5,393	$ 4,895
Average Life									5 years	5 years
Customer contracts and relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets									$ 4,098	$ 4,214	6,009
Gross Carrying Amount	30,583				28,692				30,583	28,692
Accumulated Amortization	(22,283)				(19,051)				(22,283)	(19,051)
Total	8,300				9,641				$ 8,300	$ 9,641
Average Life									8 years	8 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets									$ 25	$ 0	189
Gross Carrying Amount	150				0				150	0
Accumulated Amortization	(25)				0				(25)	0
Total	125				0				$ 125	$ 0
Average Life									1 year	0 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets									$ 29	$ 0	$ 0
Gross Carrying Amount	350				0				350	0
Accumulated Amortization	(29)				0				(29)	0
Total	$ 321				$ 0				$ 321	$ 0
Average Life									2 years	0 years

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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