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Fair Value Disclosures - Schedule of fair value measurement inputs and valuation techniques (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Mar. 31, 2023
Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Finance receivables held for sale |  | $ 50,306 | $ 105,971
Repossessed assets held for sale |  | 395 | 1,491
Fair Value |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Finance receivables held for sale |  | 50,306 | 105,971
Repossessed assets held for sale |  | $ 395 | $ 1,491
Finance Receivables | Discounted Cash Flow | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Weighted Average Discount Rate | [1] | 17.30% |
Finance Receivables | Discounted Cash Flow | Level 3 | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount Rate |  | 17.60% |
Finance Receivables | Discounted Cash Flow | Level 3 | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount Rate |  | 16.40% |
Finance Receivables | Fair Value | Discounted Cash Flow | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Finance receivables held for sale |  | $ 50,306 |
Repossessed Assets | Discounted Cash Flow | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Weighted Average Discount Rate | [1] | 17.30% |
Repossessed Assets | Discounted Cash Flow | Level 3 | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount Rate |  | 17.60% |
Repossessed Assets | Discounted Cash Flow | Level 3 | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount Rate |  | 16.40% |
Repossessed Assets | Fair Value | Discounted Cash Flow | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Repossessed assets held for sale |  | $ 395 |
[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
Name: | nick_RepossessedAssets1
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
Name: | nick_WeightedAverageDiscountRate
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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Data Type: | xbrli:stringItemType
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- Details
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- Details
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