Treasury Stock (Tables)

12 Months Ended

May 31, 2018

Stockholders' Equity Attributable to Parent [Abstract]

Tabular disclosure of entity's treasury stock

The Company has authorizations from the Board of Directors to repurchase Common Stock, from time to time as conditions allow, on the open market or through negotiated private transactions, as summarized in the table below:

Authorizations	Amount
July 2015	$	50.0
March 2018	50.0
Total current Board authorizations	$	100.0
Less repurchases made under the authorizations as of May 31, 2018	$	(38.6	)
Remaining Board authorization at May 31, 2018	$	61.4