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Finance Receivables (Detail Textuals) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Period for maintaining historical write off information with respect to static pool | 10 years |
Percentage of liquidation level assist in determining allowance for credit losses for 1st snapshot | 20.00% |
Percentage of liquidation level assist in determining allowance for credit losses for 2nd snapshot | 40.00% |
Percentage of liquidation level assist in determining allowance for credit losses for 3rd snapshot | 60.00% |
Percentage of liquidation level assist in determining allowance for credit losses in 4th snapshot | 80.00% |
Percentage of liquidation level assist in determining allowance for credit losses in 5th snapshot | 100.00% |
Direct Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual interest rate | 26.00% | 26.10%
Percentage of direct loan to total loan portfolio | 3.00% |
Finance receivables | Contracts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual interest rate | 22.70% | 22.60%
Minimum | Direct Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Finance receivables, net | $ 1,000 |
Initial term of the direct finance receivables | 12 months |
Minimum | Finance receivables | Contracts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Initial term of the indirect finance receivables | 12 months |
Maximum | Direct Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Finance receivables, net | $ 15,000 |
Initial term of the direct finance receivables | 72 months |
Maximum | Finance receivables | Contracts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Initial term of the indirect finance receivables | 60 months |

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- Definition Finance receivables average interest rate. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This item represents the percentage of the direct loan in the total loan portfolio. + References No definition available. + Details
Name: | nick_FinanceReceivablesPercentage
Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This item represents initial term of direct finance receivables. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition This item represents initial term of indirect finance receivables. + 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 Represents Percentage of liquidation level assist in determining allowance for credit losses. + 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 Percentage of liquidation level assist in determining allowance for credit losses. + References No definition available. + Details
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- Definition Represents Percentage of liquidation level assist in determining allowance for credit losses . + References No definition available. + Details
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- Definition Represents Percentage of liquidation level assist in determining allowance for credit losses. + References No definition available. + Details
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- Definition Represents Percentage of liquidation level assist in determining allowance for credit losses. + 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 Period for maintaining historical write off information with respect to static pool. + References No definition available. + Details
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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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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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