CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Sep. 30, 2011
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]
Exchange of existing aircraft, fair value	$ 4.0
Additional payments to acquire replacement aircraft	10.0
Non-cash loss included in other income (expense)	$ 4.4

The aggregate impact on earnings in the period of (a) the loss (gain) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired during the reporting period, and (b) the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

No definition available.

Name:	us-gaap_LossesGainsOnSalesOfAssetsAndAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration