SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015 USD ($) $ / shares	Jun. 30, 2015 USD ($) $ / shares	Mar. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares	Sep. 30, 2014 USD ($) $ / shares	Jun. 30, 2014 USD ($) $ / shares	Mar. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($) $ / shares	Sep. 30, 2015 USD ($) item $ / shares shares	Sep. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2013 USD ($) $ / shares shares
Revenue Recognition
Number of estimates, a change in which could have material effect on financial position or results of operations | item									1
Allocation of arrangement consideration to the up-front deliverables									$ 0
Revenue for the delivery of up-front units of accounting									$ 0
Number of transportation systems service contracts, which contain annual system usage incentives | item									1
Stock-Based Compensation
Vesting period of performance-based RSUs									3 years
Net Income Per Share
Net income attributable to Cubic	$ 19,977	$ 8,780	$ (11,024)	$ 5,152	$ 32,805	$ 12,206	$ 16,092	$ 8,388	$ 22,885	$ 69,491	$ 25,086
Weighted average shares - basic | shares									26,872	26,787	26,736
Effect of dilutive securities (in shares) | shares									66	58	24
Weighted average shares - diluted | shares									26,938	26,845	26,760
Basic (in dollars per share) | $ / shares	$ 0.74	$ 0.33	$ (0.41)	$ 0.19	$ 1.22	$ 0.46	$ 0.60	$ 0.31	$ 0.85	$ 2.59	$ 0.94
Diluted (in dollars per share) | $ / shares	$ 0.74	$ 0.33	$ (0.41)	$ 0.19	$ 1.22	$ 0.45	$ 0.60	$ 0.31	$ 0.85	$ 2.59	$ 0.94