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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | May 31, 2019 | May 31, 2018
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Allowance on accounts receivable | $ 37,809 | $ 33,510
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) | 184,790,626 | 182,723,471
Common stock, shares outstanding (in shares) | 103,284,401 | 106,326,383
Treasury stock, shares (in shares) | 81,506,225 | 76,397,088

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