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Earnings Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Aug. 31, 2012 | Aug. 31, 2011
Basic EPS: |  |
Net income attributable to AAR and noncontrolling interest | $ 18.3 | $ 16.6
Less income attributable to participating shares | (0.6) | (0.6)
Less income attributable to noncontrolling interest | (0.1) |
Net income attributable to AAR available to common shareholders | 17.6 | 16.0
Basic shares: |  |
Weighted average common shares outstanding | 38,500,000 | 38,900,000
Earnings per share - basic: |  |
Earnings per share - basic (in dollars per share) | $ 0.46 | $ 0.41
Diluted EPS: |  |
Net income attributable to AAR and noncontrolling interest | 18.3 | 16.6
Less income attributable to participating shares | (0.6) | (0.5)
Less income attributable to noncontrolling interest | (0.1) |
Add after-tax interest on convertible debt | 1.2 | 1.5
Net income attributable to AAR available to common shareholders - Diluted | $ 18.8 | $ 17.6
Diluted shares: |  |
Weighted average common shares outstanding | 38,500,000 | 38,900,000
Additional shares from the assumed exercise of stock options |  | 400,000
Additional shares from the assumed conversion of convertible debt | 3,200,000 | 4,000,000
Weighted average common shares outstanding - diluted | 41,700,000 | 43,300,000
Earnings per share - diluted: |  |
Earnings per share - diluted (in dollars per share) | $ 0.45 | $ 0.41
Antidilutive stock options excluded from the computation of diluted earnings per share (in shares) | 1,489,672 | 210,000

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