Segment Information (Details 2) (Change in estimated total costs, USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 31, 2011
Change in estimated total costs
Revenue recognition
Increase (decrease) in operating profit	$ 1.2
Increase (decrease) in net income	$ 0.9
Increase (decrease) in net income per common share (in dollars per share)	$ 0.03

Represents the increase (decrease) in operating income during the period as a result of change in estimates.

No definition available.

Name:	cub_IncreaseDecreaseInOperatingIncomeLoss
Namespace Prefix:	cub_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration