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RELATED PARTY TRANSACTIONS (Details) - Affiliated Entity - Mariposa Capital - Advisory Services Agreement $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Related Party Transaction
Related party transaction expense	$ 3.0
Automatic renewal term	1 year
Agreement renewal period	90 days

X

- Definition

Related Party, Automatic Renewal Period

+ References

No definition available.

+ Details

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Namespace Prefix:	esi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The length of time to give notice to not renew a related party agreement.

+ References

No definition available.

+ Details

Name:	esi_RelatedPartyNoticeOfNonRenewalToAgreement
Namespace Prefix:	esi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=esi_MariposaCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=esi_AdvisoryServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: