Commitments and Contingencies (Details) $ in Millions	May 31, 2018 USD ($)
Fiscal Years 2009 Through 2011
Loss Contingencies Line Items
Potential additional income tax payment due	$ 28.6
Fiscal Years 2012 through 2014
Loss Contingencies Line Items
Potential additional income tax payment due	$ 5.3

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration