Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Income Per Share
Net income attributable to Cubic	$ 12,206	$ 18,381	$ 36,686	$ 62,272
Weighted average shares - basic	26,789	26,736	26,786	26,736
Effect of dilutive securities (in shares)	132	26	115	9
Weighted average shares - diluted	26,921	26,762	26,901	26,745
Net income per share attributable to Cubic, basic (in dollars per share)	$ 0.46	$ 0.69	$ 1.37	$ 2.33
Effect of dilutive securities (in dollars per share)	$ (0.01)		$ (0.01)
Net income per share attributable to Cubic, diluted (in dollars per share)	$ 0.45	$ 0.69	$ 1.36	$ 2.33