Program Development Costs (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Nov. 30, 2012	May 31, 2012
Program Development Costs
Minimum expected revenue from the cargo loading system program	$ 300
Net costs capitalized associated with the engineering and development of the cargo system.	$ 105.5	$ 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