Treasury Stock (Tables)

3 Months Ended

Aug. 31, 2017

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 August 31, 2017	(16.1		)
Remaining Board authorization at August 31, 2017	$	33.9