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Fair Value Disclosures - Schedule of fair value measurement inputs and valuation techniques (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of receivable interest discount |  | 6.30% | 6.50%
Estimated Fair Value Measurement [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables held for sale |  | $ 38,773 | $ 105,971
Repossessed assets held for sale |  | 668 | 1,491
Fair Value Inputs Level3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables held for sale |  | 38,773 | 105,971
Repossessed assets held for sale |  | 668 | $ 1,491
Fair Value Inputs Level3 [Member] | Finance Receivables [Member] | Estimated Fair Value Measurement [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables held for sale |  | 38,773 |
Fair Value Inputs Level3 [Member] | Repossessed Assets [Member] | Estimated Fair Value Measurement [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Repossessed assets held for sale |  | $ 668 |
Fair Value Inputs Level3 [Member] | Valuation Technique Discounted Cash Flow [Member] | Finance Receivables [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted Average | [1] | 17.30% |
Fair Value Inputs Level3 [Member] | Valuation Technique Discounted Cash Flow [Member] | Repossessed Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted Average | [1] | 17.30% |
Maximum [Member] | Fair Value Inputs Level3 [Member] | Valuation Technique Discounted Cash Flow [Member] | Finance Receivables [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of receivable interest discount |  | 17.60% |
Maximum [Member] | Fair Value Inputs Level3 [Member] | Valuation Technique Discounted Cash Flow [Member] | Repossessed Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of receivable interest discount |  | 17.60% |
Minimum [Member] | Fair Value Inputs Level3 [Member] | Valuation Technique Discounted Cash Flow [Member] | Finance Receivables [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of receivable interest discount |  | 16.40% |
Minimum [Member] | Fair Value Inputs Level3 [Member] | Valuation Technique Discounted Cash Flow [Member] | Repossessed Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of receivable interest discount |  | 16.40% |
[1] |
(1) | Weighted averages are determined by the relative fair value of the instruments or the relative contribution to the instruments fair value.

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- Definition Notes Receivable Fair Value + References No definition available. + Details
Name: | nick_NotesReceivableFairValue
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the percentage of finance receivable interest discount. + References No definition available. + Details
Name: | nick_PercentageOfReceivableInterestDiscount
Namespace Prefix: | nick_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Repossessed assets 1 + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents weighted average discount 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 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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- Details
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