Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Net Income Per Share
Net income attributable to Cubic	$ 16,092	$ 29,650	$ 24,480	$ 43,891
Weighted average shares - basic	26,786	26,736	26,785	26,736
Effect of dilutive securities (in shares)	115		107
Weighted average shares - diluted	26,901	26,736	26,892	26,736
Net income per share attributable to Cubic, basic (in dollars per share)	$ 0.60	$ 1.11	$ 0.91	$ 1.64
Net income per share attributable to Cubic, diluted (in dollars per share)	$ 0.60	$ 1.11	$ 0.91	$ 1.64
Anti-dilutive employee share-based awards			15