Investment in Limited Partnership - Remaining Life Expectancy and Face Value of Life Settlements (Details) - WE Investment $ in Thousands	Feb. 29, 2020 USD ($) contract
Number of Life Settlement Contracts
0-1 \| contract	10
1-2 \| contract	22
2-3 \| contract	37
3-4 \| contract	53
4-5 \| contract	54
Thereafter \| contract	348
Total \| contract	524
Face Value
0-1 \| $	$ 43,124
1-2 \| $	80,793
2-3 \| $	133,059
3-4 \| $	256,248
4-5 \| $	260,434
Thereafter \| $	1,679,494
Total \| $	$ 2,453,152

Face value (death benefits) of the life insurance policies underlying the life settlement contracts accounted for under the fair value method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 8
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodFaceValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodFaceValueMaturingAfterYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in remainder of current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodFaceValueMaturingInRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodFaceValueMaturingInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodFaceValueMaturingInYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodFaceValueMaturingInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodFaceValueMaturingInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Number of life settlement contracts accounted for under the fair value method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodNumberOfContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of life settlement contracts accounted for under fair value method maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodNumberOfContractsMaturingAfterYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of life settlement contracts accounted for under fair value method maturing in remainder of current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodNumberOfContractsMaturingInRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of life settlement contracts accounted for under fair value method maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodNumberOfContractsMaturingInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of life settlement contracts accounted for under fair value method maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodNumberOfContractsMaturingInYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of life settlement contracts accounted for under fair value method maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodNumberOfContractsMaturingInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of life settlement contracts accounted for under fair value method maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610

+ Details

Name:	us-gaap_LifeSettlementContractsFairValueMethodNumberOfContractsMaturingInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=emg_WhiteEagleAssetPortfolioLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: