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

No definition available.

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

- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of finance receivables by type or by instrument at that time.

+ References

No definition available.

+ Details

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

- Definition

This item represents initial term of direct finance receivables.

+ References

No definition available.

+ Details

Name:	nick_InitialTermsOfDirectFinanceReceivables
Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents initial term of indirect finance receivables.

+ References

No definition available.

+ Details

Name:	nick_InitialTermsOfIndirectFinanceReceivables
Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
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://www.xbrl.org/2003/role/presentationRef
-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

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

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_FinanceReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CustomerContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
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Finance Receivables (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net	$ 269,876	$ 317,205
Finance receivables \| Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average contractual interest rate	22.29%	22.37%
Finance receivables, net	$ 262,818	$ 309,620	$ 303,919
Finance receivables \| Contracts \| Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of the indirect finance receivables	12 months
Finance receivables \| Contracts \| Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of the indirect finance receivables	72 months
Finance receivables \| Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average contractual interest rate	25.07%	25.62%
Finance receivables, net	$ 7,058	$ 7,585	$ 7,918
Percentage of direct loan to total loan portfolio	2.00%
Finance receivables \| Direct Loans \| Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of the direct finance receivables	12 months
Finance receivables, net	$ 1
Finance receivables \| Direct Loans \| Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of the direct finance receivables	72 months
Finance receivables, net	$ 11