Basic and Diluted Earnings Per Share (Narrative) (Details) shares in Millions, $ in Millions |
3 Months Ended | |
|---|---|---|
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Aug. 31, 2016
USD ($)
item
shares
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Aug. 31, 2015
USD ($)
shares
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| Number of stock repurchase programs | item | 2 | |
| Authorized in May 2014 [Member] | ||
| Approved repurchase amount | $ 350.0 | |
| Authorized in July 2016 [Member] | ||
| Approved repurchase amount | $ 350.0 | |
| Common Stock [Member] | ||
| Common stock issued in connection with exercise or vesting of stock-based awards | shares | 1.3 | 0.7 |
| Common Stock [Member] | Authorized in May 2014 [Member] | ||
| Common shares repurchased and retired | shares | 1.3 | |
| Common stock repurchased and retired | $ 62.9 | |
| X | ||||||||||
- Definition Stock Repurchase Program, Number of Programs No definition available.
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| X | ||||||||||
- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. No definition available.
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| X | ||||||||||
- Definition Amount of stock repurchase plan authorized. No definition available.
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| X | ||||||||||
- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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