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Treasury Stock (Tables)
9 Months Ended
Feb. 29, 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
 
September 2010
$
44.0

(a) 
Additional authorization July 2015
50.0

 
Less repurchases made under the authorizations as of February 29, 2016
(41.1
)
 
Remaining Board authorization at February 29, 2016
$
52.9