Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Feb. 28, 2015	May 31, 2014
Current assets:
Cash and cash equivalents	$ 67.0	$ 89.2
Accounts receivable, less allowances of 5.8 and $6.2, respectively	249.6	283.1
Inventories	451.0	495.3
Rotable spares and equipment on or available for short-term lease	139.9	137.6
Assets of discontinued operations	529.3
Deposits, prepaids and other	39.6	81.6
Deferred tax assets	18.5	30.1
Total current assets	1,494.9	1,116.9
Property, plant and equipment, net of accumulated depreciation of $371.4 and $424.3, respectively	247.4	314.9
Other assets:
Goodwill	123.6	261.7
Intangible assets, net of accumulated amortization of $21.6 and $36.2, respectively	38.0	165.4
Equipment on or available for long-term lease	110.8	98.4
Capitalized program development costs		112.2
Investment in joint ventures	27.3	29.9
Other	91.8	100.1
Total other assets	391.5	767.7
Total assets	2,133.8	2,199.5
Current liabilities:
Current maturities of long-term debt	43.9	69.7
Accounts and trade notes payable	164.6	171.1
Accrued liabilities	125.0	161.3
Liabilities of discontinued operations	57.3
Total current liabilities	390.8	402.1
Long-term debt, less current maturities	599.4	564.3
Deferred tax liabilities	139.1	162.2
Other liabilities and deferred income	62.7	70.2
Total noncurrent liabilities	801.2	796.7
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 44,953,514 and 44,674,186 shares at cost, respectively	45.0	44.7
Capital surplus	442.2	436.4
Retained earnings	632.2	646.0
Treasury stock, 5,137,409 and 5,113,939 shares at cost, respectively	(99.8)	(98.3)
Accumulated other comprehensive loss	(78.7)	(29.3)
Total AAR stockholders' equity	940.9	999.5
Noncontrolling interest	0.9	1.2
Total equity	941.8	1,000.7
Total liabilities and equity	$ 2,133.8	$ 2,199.5