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Concentrations of credit risk and major customers | 12 Months Ended
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Sep. 30, 2018
Risks and Uncertainties [Abstract] |
Concentrations of credit risk and major customers | Concentrations of credit risk and major customers Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of accounts receivable — billed, billable and unbilled. The majority of our business is in the United States. Revenue from foreign projects and offices was 29%, 28% and 28% of total revenue for the years ended September 30, 2018, 2017 and 2016, respectively. For each of the years ended September 30, 2018, our total revenue was derived from the following customers:
| Year ended September 30,
| 2018 |  | 2017 |  | 2016
State and local government agencies | 51 | % |  | 49 | % |  | 46 | %
Foreign government agencies | 27 | % |  | 26 | % |  | 26 | %
U.S. Federal Government agencies | 16 | % |  | 19 | % |  | 22 | %
Other sources | 6 | % |  | 6 | % |  | 6 | %
Many of the state government agency programs receive significant federal funding. The other sources include local municipalities and commercial customers. We believe that the credit risk associated with our receivables is limited due to the creditworthiness of these customers. During fiscal year 2018, the U.S. Federal Government, the U.K. Government, the Australia Government and the State of New York each provided more than 10% of our annual revenue. Within these governments, we may be serving several distinct agencies. Revenue from the U.S. Federal Government was exclusively within the U.S. Federal Segment. Revenue from the U.K. Government was both within the Health Services and Human Services Segments. Revenue from the State of New York was exclusively within our Health Services Segment. Revenue from the Australian Government was exclusively within our Human Services Segment. The proportion of revenue recognized from customers providing in excess of 10% of our consolidated revenue for each of the three years ended September 30, 2018, was as follows:
| Year ended September 30,
| 2018 |  | 2017 |  | 2016
U.S. Federal Government | 16 | % |  | 19 | % |  | 22 | %
New York | 16 | % |  | 15 | % |  | 12 | %
United Kingdom | 12 | % |  | 12 | % |  | 16 | %
Australia | 10 | % |  | * |  |  | * |
______________________ * Government provided less than 10% of our consolidated revenue in this fiscal year.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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- References No definition available. + Details
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