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

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

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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.

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Represents the number of aircraft for which the entity has entered into an agreement for sale.

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Represents the number of aircraft owned by the entity.

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Represents the number of aircraft sold by the joint venture partners during the period.

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Represents the revenue generated from sale of assets of joint venture by joint venture partners.

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- Definition

Decrease for amounts repaid on the debt instrument for the period.

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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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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.

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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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Aircraft Portfolio (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011	May 31, 2012
Aircraft portfolio
Sales from services	$ 221.0	$ 162.7	$ 444.0	$ 316.8
Components of investment in the wholly-owned aircraft, after consideration of financing
Debt	(778.9)		(778.9)		(792.2)
Note payable due July 19, 2012 with interest at 7.22%, payable monthly
Components of investment in the wholly-owned aircraft, after consideration of financing
Debt					(8.4)
Debt repayment			8.4
Aircraft \| Owned Through Joint Ventures
Aircraft portfolio
Owned aircraft, number	16		16
Number of aircraft for which agreement to sell has been entered into	10
Equity investments	41.8		41.8		41.3
Membership interest in limited liability companies (as a percent)	50.00%		50.00%
Sales from services			0.3	0.4
Summarized income statement information
Sales	21.3	12.0	30.1	21.5
Income before provision for income taxes	2.6	0.6	5.4	1.2
Number of aircraft sold by joint venture partners	2
Revenue from sale of aircraft by joint venture partners	13.9
Balance sheet information:
Assets	158.0		158.0		169.6
Debt	65.4		65.4		75.6
Members' capital	87.7		87.7		88.8
Aircraft \| Wholly-Owned
Aircraft portfolio
Owned aircraft, number	2		2
Components of investment in the wholly-owned aircraft, after consideration of financing
Gross carrying value	22.9		22.9		25.2
Debt					(8.4)
Net AAR investment	$ 22.9		$ 22.9		$ 16.8