Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Income Per Share
Net income attributable to Cubic	$ 4,498	$ 8,780	$ 9,228	$ 2,908
Weighted average shares - basic	26,977	26,883	26,971	26,868
Effect of dilutive securities (in shares)	81	77	39	57
Weighted average shares - diluted	27,058	26,960	27,010	26,925
Net income per share, basic (in dollars per share)	$ 0.17	$ 0.33	$ 0.34	$ 0.11
Net income per share attributable to Cubic, diluted (in dollars per share)	$ 0.17	$ 0.33	$ 0.34	$ 0.11
Anti-dilutive employee share-based awards	0	0	0	0