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Finance Receivables - Selected information on entire portfolio of Company (Details 1) - Contract | 9 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Contract Portfolio |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Average APR | 22.80% | 22.80%
Average discount | 6.80% | 7.40%
Average term (months) | 50 months | 50 months
Number of active contracts | 16,364 | 20,013
Direct Loan Portfolio |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Average APR | 30.00% | 29.80%
Average term (months) | 26 months | 26 months
Number of active contracts | 6,505 | 6,103

X
- Definition Represents number of active contracts. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents weighted average discount rate on the entire portfolio. + References No definition available. + Details
Name: | nick_WeightedAverageDiscountRate
Namespace Prefix: | nick_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents weighted average percent rate on the entire portfolio. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents weighted average term on the entire portfolio. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |