Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2018	Jan. 23, 2019
Document and Entity Information
Entity Registrant Name	CUBIC CORP /DE/
Entity Central Index Key	0000026076
Document Type	10-Q
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		31,150,232
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1