Basis for Presentation (Details)	6 Months Ended
Mar. 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Net Sales, Recognized under Units-of-Delivery Method	13.00%

Represents the percentage of net sales used the units-of-delivery method to recognize revenue during the year.

No definition available.

Name:	cub_PercentageOfNetSalesRecognizedUnderUnitsOfDeliveryMethod
Namespace Prefix:	cub_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration