Program Development Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Aug. 31, 2012	May 31, 2012
Program Development Costs
Minimum expected revenue from the cargo handling system program	$ 300
Net costs capitalized associated with the engineering and development of the cargo system.	$ 101.7	$ 91.9

Represents costs associated with the engineering and development of the cargo system.

No definition available.

Name:	air_CargoSystemEngineeringAndDevelopmentCostsCapitalized
Namespace Prefix:	air_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant