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Inventory (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Feb. 28, 2015
aircraft
May 31, 2014
aircraft
Inventory    
Raw materials and parts $ 41.7us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves 114.1us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves
Work-in-process 19.4us-gaap_InventoryWorkInProcessNetOfReserves 57.5us-gaap_InventoryWorkInProcessNetOfReserves
Aircraft and engine parts, components and finished goods 359.6us-gaap_InventoryFinishedGoodsNetOfReserves 297.3us-gaap_InventoryFinishedGoodsNetOfReserves
Aircraft held for sale and related support parts 30.3air_AircraftHeldForSaleAndRelatedSupportPartsNetOfReserves 26.4air_AircraftHeldForSaleAndRelatedSupportPartsNetOfReserves
Total inventories 451.0us-gaap_InventoryNet 495.3us-gaap_InventoryNet
Inventory    
Number of aircrafts held for sale 12air_NumberOfAircraftsHeldForSale 9air_NumberOfAircraftsHeldForSale
Fixed-wing aircraft    
Inventory    
Number of aircrafts held for sale 4air_NumberOfAircraftsHeldForSale
/ us-gaap_ProductOrServiceAxis
= air_FixedWingAircraftMember
5air_NumberOfAircraftsHeldForSale
/ us-gaap_ProductOrServiceAxis
= air_FixedWingAircraftMember
Inventory impairment charge $ 4.7us-gaap_InventoryWriteDown
/ us-gaap_ProductOrServiceAxis
= air_FixedWingAircraftMember
 
Rotary-wing aircraft    
Inventory    
Number of aircrafts held for sale 8air_NumberOfAircraftsHeldForSale
/ us-gaap_ProductOrServiceAxis
= air_RotaryWingAircraftMember
4air_NumberOfAircraftsHeldForSale
/ us-gaap_ProductOrServiceAxis
= air_RotaryWingAircraftMember