Revenue and Contract Receivables, net, Revenue Recognition (Details) - USD ($) $ in Millions	Oct. 27, 2018	Jul. 31, 2018
Revenue Recognition [Abstract]
Allowance for potential disallowances resulting from government audits	$ 0.7	$ 0.7

The amount of allowance for potential disallowances resulting from government audits recorded in other accrued liabilities.

No definition available.

Name:	eei_AllowanceForPotentialDisallowancesResultingFromGovernmentAudits
Namespace Prefix:	eei_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant