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Credit Losses - Summary of Change in Allowance for Credit Losses (Details) $ in Thousands | 9 Months Ended
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Jun. 30, 2021 USD ($)
Receivables [Abstract] |
Beginning balance | $ (1,394)
Current period recovery for expected credit losses | 521
Write-offs charged against the allowance for expected credit losses | (109)
Foreign exchange impact on ending balance | 82
Ending balance | $ (900)

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- 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

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

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

X
- Definition Accounts receivable and contract with customer assets allowance for credit loss write-offs. + References No definition available. + Details
Name: | crnc_AccountsReceivableAndContractWithCustomerAssetsAllowanceForCreditLossWriteOffs
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