Aircraft Portfolio (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Aug. 31, 2012	Aug. 31, 2011	May 31, 2012
Aircraft portfolio
Sales from services	$ 223.0	$ 154.1
Components of investment in the wholly-owned aircraft, after consideration of financing
Debt	(787.6)		(792.2)
Aircraft \| Owned Through Joint Ventures
Aircraft portfolio
Owned aircraft, number	18		18
Equity investments	41.3		41.3
Membership interest in limited liability companies (as a percent)	50.00%
Sales from services	0.2	0.2
Summarized income statement information
Sales	8.8	9.5
Income before provision for income taxes	2.9	0.6
Balance sheet information:
Assets	164.8		169.6
Debt	71.2		75.6
Members' capital	87.7		88.8
Aircraft \| Wholly-Owned
Aircraft portfolio
Owned aircraft, number	2
Components of investment in the wholly-owned aircraft, after consideration of financing
Gross carrying value	23.9		25.2
Debt			(8.4)
Net AAR investment	$ 23.9		$ 16.8

Represents the gross carrying value of the aircraft on short-term and long-term leases with commercial airlines.

No definition available.

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The amount of debt reported by an equity method investment of the entity.

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No definition available.

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Represents the net investment in aircraft, taking into account the gross carrying value, debt and capital lease obligations related to the aircraft.

+ References

No definition available.

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Represents the number of aircraft owned by the entity.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The amount of assets reported by an equity method investment of the entity.

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The amount of equity (capital) attributable to the equity method investment of the entity.

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The amount of income (loss) from continuing operations before extraordinary items reported by an equity method investment of the entity.

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

+ References

No definition available.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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