Concentrations of credit risk and major customers (Tables)

12 Months Ended

Sep. 30, 2017

Risks and Uncertainties [Abstract]

Schedule of revenue recognized from customers

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, 2017 was from the following governments:

	Year ended September 30,
	2017		2016		2015
U.S. Federal Government	19	%	22	%	20	%
New York	15	%	12	%	10	%
United Kingdom	12	%	16	%	*

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* Government provided less than 10% of our consolidated revenue in this year.