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Finance Receivables - Selected information on entire portfolio of Company (Details 1) - Contract | 9 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Contract Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average APR | 22.70% | 22.70%
Average discount | 7.70% | 7.50%
Average term (months) | 51 months | 53 months
Number of active contracts | 25,995 | 29,061
Direct Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average APR | 27.00% | 26.00%
Average term (months) | 26 months | 27 months
Number of active contracts | 3,376 | 2,641

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: | num: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: | num: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
Balance Type: | na
Period Type: | duration

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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: |