Program Development Costs (Details) (USD $) In Millions, unless otherwise specified	Feb. 28, 2014	May 31, 2013
Program Development Costs
Expected revenue from cargo loading system program	$ 250
Net costs capitalized associated with the engineering and development of the cargo system	133.7	130.9
Net costs capitalized associated with the engineering and development of the cargo system, current	20.3	6.0
Net costs capitalized associated with the engineering and development of the cargo system, non-current	$ 113.4	$ 124.9

Represents all costs associated with the engineering and development of the cargo system, including both current and noncurrent portions.

No definition available.

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