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Treasury Stock (Tables)
6 Months Ended
Nov. 30, 2016
Stockholders' Equity Attributable to Parent [Abstract]  
Tabular Disclosure of an Entity's Treasury Stock
The table below represents the current Board authorization:
 
Amount
 
July 2015
50.0

 
Less repurchases made under the authorization as of November 30, 2016
(10.5
)
 
Remaining Board authorization at November 30, 2016
$
39.5