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Employee Retention Credit (Details Narrative) - USD ($) $ in Thousands	Mar. 27, 2021	Dec. 26, 2020
Employee Retention Credit
Employee retention credit	$ 1,676	$ 0

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- References

No definition available.

+ Details

Name:	ENG_EmployeeRetentionCreditAbstract
Namespace Prefix:	ENG_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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No definition available.

+ Details

Name:	ENG_EmployeeRetentionCreditCurrent
Namespace Prefix:	ENG_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant