Summary of Significant Accounting Policies (Details 5) (BMI)	12 Months Ended
Jul. 31, 2013
BMI
Business Combinations
Price floor period	3 years

Represents the price floor period relating to the acquisition of the Byrne Medical Business whose fair value was determined using a option valuation model.

No definition available.

Name:	cmn_BusinessAcquisitionPriceFloorPeriod
Namespace Prefix:	cmn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration