Program Development Costs (Details) (USD $) In Millions, unless otherwise specified	Aug. 31, 2013	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, current and noncurrent	$ 126.9	$ 130.9

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