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Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Oct. 01, 2018
Revenue Recognition
Retained earnings	$ 174,248	$ 599,548
ASU 2014-09
Revenue Recognition
Retained earnings				$ 7,000
Subcontractor and other direct costs	$ 7,100,000	$ 7,400,000	$ 7,700,000

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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