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Treasury Stock (Tables) | 3 Months Ended
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Aug. 31, 2013
Disclosure Text Block Supplement [Abstract] |
Tabular Disclosure of an Entity's Treasury Stock [Table Text Block] | The Board of Directors has authorized the Company to repurchase Common Stock, from time to time as conditions allow, on the open market or through negotiated private transactions. The table below represents the remaining Board authorization:
Board Authorization |  | Amount |
September 2010 |  | $ | 44.0 |
Less repurchases made under this authorization |  |  | (25.0 | )
Remaining Board authorization at August 31, 2013 |  | $ | 19.0 |

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- Definition Tabular disclosure of an entity's treasury stock including amount authorized by an entity's board of directors, the number of shares repurchased and the remaining maximum dollar value of shares available for repurchase under the program + References No definition available. + Details
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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration