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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | May 31, 2012 | May 31, 2011
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Statement of Financial Position [Abstract] |  |
Allowance on accounts receivable | $ 17,017 | $ 17,057
Preferred stock, shares authorized (in shares) | 100,000 | 100,000
Preferred stock, shares outstanding ( in shares) | 0 | 0
Common stock, shares authorized (in shares) | 425,000,000 | 425,000,000
Common stock, shares issued (in shares) | 173,745,913 | 173,346,180
Common stock, shares outstanding (in shares) | 126,519,758 | 137,583,884
Treasury stock, shares (in shares) | 47,226,155 | 35,762,296

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