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Treasury Stock (Tables)
3 Months Ended
Aug. 31, 2016
Stockholders' Equity Attributable to Parent [Abstract]  
Tabular Disclosure of an Entity's Treasury Stock
The Board 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:
 
Amount
 
Additional authorization July 2015
50.0

 
Less repurchases made under the authorizations as of August 31, 2016
(4.5
)
 
Remaining Board authorization at August 31, 2016
$
45.5