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Revenue Recognition - Accounts receivable, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Billed	$ 2,419,600	$ 2,368,200
Contract retentions	524,200	557,500
Total accounts receivable-gross	2,943,800	2,925,700
Allowance for doubtful accounts	(77,900)	(56,500)
Total accounts receivable-net	$ 2,865,888	$ 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	$ 170,000	$ 110,000
Trade receivables sold, outstanding	166,600	91,900
Total
Total accounts receivable-net	$ 2,865,900	$ 2,869,200
Other than U.S government outstanding receivables
Additional disclosures
Number of clients	No	No
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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