Concentrations of credit risk and major customers (Tables)

12 Months Ended

Sep. 30, 2016

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, 2016 was from the following governments:

	Year ended September 30,
	2016		2015		2014
U.S. Federal Government	22	%	20	%	17	%
United Kingdom	16	%	*		*
New York	12	%	10	%	*
Australia	*		*		10	%
California	*		*		10	%
Texas	*		*		10	%