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Concentrations of credit risk and major customers (Tables) | 12 Months Ended
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Sep. 30, 2018
Risks and Uncertainties [Abstract] |
Schedule of revenue recognized from customers | 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 | %
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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