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Client Funds - Additional Information (Details)	Dec. 31, 2023 USD ($)
Custodial
Funds Held for Clients [Line Items]
Funds held for clients	$ 494,329,000

X

- Definition

[Line Items] for Funds Held for Clients [Table]

+ References

No definition available.

+ Details

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Namespace Prefix:	crda_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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

X

- Details

Name:	us-gaap_AwardTypeAxis=crda_CustodialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: