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Revenue Recognition - Accounts receivable, net (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Billed	$ 2,353,700	$ 2,284,800
Contract retentions	602,200	641,500
Total accounts receivable-gross	2,955,900	2,926,300
Allowance for doubtful accounts	(67,000)	(57,100)
Total accounts receivable-net	$ 2,888,939	$ 2,869,216
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	$ 110,000	$ 110,000
Trade receivables sold, outstanding	$ 97,000	$ 91,900
Other than U.S government outstanding receivables
Additional disclosures
Number of clients	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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Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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