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Revenue Recognition - Accounts receivable, net (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2019 USD ($) customer	Sep. 30, 2018 USD ($) customer
Billed	$ 2,931,700	$ 2,697,700
Contract retentions	641,500	661,700
Total accounts receivable-gross	3,573,200	3,359,400
Allowance for doubtful accounts	(56,100)	(51,600)
Total accounts receivable-net	$ 3,517,072	$ 3,307,851
Additional disclosures
Unbilled receivables are expected to be billed and collected (in months)	12 months	12 months
Significant claims recorded in contract assets and other non-current assets	$ 340,000	$ 266,000
Trade receivables sold, outstanding	364,500	334,200
Total
Total accounts receivable-net	$ 3,517,100	$ 3,307,800
Other than U.S government outstanding receivables
Additional disclosures
Number of clients | customer	0	0
Outstanding receivables (as a percent)	10.00%	10.00%

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- Definition

The amounts in excess of the agreed contract price (or amounts not included in the original contract price) that the company seeks to collect from customers or others for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price or other causes of unanticipated additional costs recorded in contract assets and other non current assets.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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Amount, after allowance for bad debt, of trade and loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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