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Revenue Recognition (Detail Textuals) | 3 Months Ended | 6 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022
Revenue Recognition and Deferred Revenue [Abstract] |  |  |
Interest income accrual on finance receivables suspension condition |  |  | Accrual of interest income on finance receivables is suspended when a loan is contractually delinquent for 61 days or more, or the collateral is repossessed, whichever is earlier. The Company reverses the accrual of interest income when the loan is contractually delinquent 61 days or more.
Average dealer discount associated with new volume | 6.40% | 6.70% |

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- Definition Represents accrual of interest income on finance receivables suspension condition. + References No definition available. + Details
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Balance Type: | na
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- Definition This element represents the percentage of finance receivable interest discount. + 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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- References No definition available. + Details
Name: | us-gaap_RevenueRecognitionAndDeferredRevenueAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
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