Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2018	Nov. 01, 2018	Mar. 31, 2018
Document and Entity Information
Entity Registrant Name	CUBIC CORP /DE/
Entity Central Index Key	0000026076
Document Type	10-K
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,469,585,039
Entity Common Stock, Shares Outstanding		27,337,991
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY