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v3.23.1

Summary of Significant Accounting Policies - Summary of Change in Allowance for Credit Losses (Details) $ in Thousands | 6 Months Ended
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Mar. 31, 2023 USD ($)
Receivables [Abstract] |
Beginning balance | $ 371
Credit loss provision | 3,626
Effect of foreign currency translation | 140
Ending balance | $ 4,137

X
- Definition Accounts receivable and contract with customer assets allowance for credit loss + References No definition available. + Details
Name: | crnc_AccountsReceivableAndContractWithCustomerAssetsAllowanceForCreditLoss
Namespace Prefix: | crnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Accounts receivable and contract with customer assets allowance for credit loss effect of foreign currency translation. + References No definition available. + Details
Name: | crnc_AccountsReceivableAndContractWithCustomerAssetsAllowanceForCreditLossEffectOfForeignCurrencyTranslation
Namespace Prefix: | crnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Accounts receivable and contract with customer assets provision for credit loss. + References No definition available. + Details
Name: | crnc_AccountsReceivableAndContractWithCustomerAssetsProvisionForCreditLoss
Namespace Prefix: | crnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration