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Finance Receivables - Finance receivables held for sale consist of Contracts and Direct Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Receivables [Abstract] |  |
Finance receivables held for sale at amortized cost | $ 56,108 | $ 0
Held for sale allowance | (17,335) | 0
Finance receivables held for sale at fair value | $ 38,773 | $ 0

X
- Definition Finance receivables held for sale at amortized cost + References No definition available. + Details
Name: | nick_FinanceReceivablesHeldForSaleAtAmortizedCost
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Finance receivables held for sale at fair value + References No definition available. + Details
Name: | nick_FinanceReceivablesHeldForSaleAtFairValue
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Held for sale allowance + References No definition available. + Details
Name: | nick_HeldForSaleAllowance
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration