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

Finance receivables average interest rate.

No definition available.

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Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the percentage of the direct loan in the total loan portfolio.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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- Definition

This item represents initial term of direct finance receivables.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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Period Type:	duration

- Definition

This item represents initial term of indirect finance receivables.

+ References

No definition available.

+ Details

Name:	nick_InitialTermsOfIndirectFinanceReceivables
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Data Type:	xbrli:durationItemType
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Period Type:	duration

- Definition

Represents Percentage of liquidation level assist in determining allowance for credit losses.

+ References

No definition available.

+ Details

Name:	nick_PercentageOfLiquidationLevelAssistInDeterminingAllowanceForCreditLosses
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Data Type:	num:percentItemType
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Period Type:	duration

- 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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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for maintaining historical write off information with respect to static pool.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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- Details

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