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Summary of Significant Accounting Policies - Intangible Assets and Impairment of Long-Lived Assets (Details) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Intangible Assets
Impairment of long-lived assets	$ 0	$ 0
Contract intangibles
Intangible Assets
Impairment of long-lived assets			$ 1,300,000
Leasehold improvements
Intangible Assets
Impairment of long-lived assets			$ 600,000

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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