Organization and Basis of Presentation (Details)	Jul. 31, 2018 Subsidiary Country
Organization and Basis of Presentation [Abstract]
Number of wholly owned and majority owned operating subsidiaries \| Subsidiary	6
Number of countries in which the company operates \| Country	4

Represents the number of wholly owned and majority owned operating subsidiaries in which the Company has direct and indirect ownership.

No definition available.

Name:	eei_NumberOfWhollyOwnedAndMajorityOwnedOperatingSubsidiaries
Namespace Prefix:	eei_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant