Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Feb. 28, 2013	May 31, 2012
Current assets:
Cash	$ 47.4	$ 67.7
Accounts receivable, less allowances of $6.7 and $8.2, respectively	302.4	302.1
Inventories	488.3	461.2
Rotable spares and equipment on or available for short-term lease	133.5	138.6
Deposits, prepaids and other	61.1	71.1
Deferred tax assets	43.4	22.6
Total current assets	1,076.1	1,063.3
Property, plant and equipment, net of accumulated depreciation of $340.0 and $298.4, respectively	363.8	382.9
Other assets:
Goodwill	256.4	262.6
Intangible assets, net of accumulated amortization of $43.6 and $34.1, respectively	161.1	155.0
Equipment on long-term lease	66.5	73.1
Investment in joint ventures	36.0	49.9
Other	257.1	208.9
Total other assets	777.1	749.5
Total assets	2,217.0	2,195.7
Current liabilities:
Short-term debt	0.6	0.6
Current maturities of long-term debt	21.6	122.2
Accounts and trade notes payable	178.4	201.4
Accrued liabilities	162.2	149.0
Total current liabilities	362.8	473.2
Long-term debt, less current maturities	700.6	669.4
Deferred tax liabilities	161.2	115.9
Other liabilities and deferred income	67.7	71.2
Total noncurrent liabilities	929.5	856.5
Equity:
Preferred stock, $1.00 par value, authorized 250,000 shares; none issued
Common stock, $1.00 par value, authorized 100,000,000 shares; issued 44,703,137 and 44,849,196 shares at cost, respectively	44.7	44.8
Capital surplus	428.5	423.6
Retained earnings	587.3	541.8
Treasury stock, 4,969,742 and 4,576,368 shares at cost, respectively	(94.3)	(90.4)
Accumulated other comprehensive loss	(42.2)	(55.2)
Total AAR shareholders' equity	924.0	864.6
Noncontrolling interest	0.7	1.4
Total equity	924.7	866.0
Total liabilities and equity	$ 2,217.0	$ 2,195.7