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Finance Receivables (Detail Textuals) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net	$ 290,656		$ 317,205
Maximum criteria for receivable to be a performing account	61 days	120 days
Minimum threshold percentage of payment due for automobile contract to be delinquent	25.00%
Minimum criteria for receivable to be a non-performing account	61 days or more
Criteria for delinquent account written off	180 days
Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of direct loan to aggregate principal amount of loan portfolio	2.00%
Direct Loans | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net	$ 1,000
Direct Loans | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net	$ 11,000

X

- Definition

This element represents the number of days after which the receivable account is considered as delinquent account which will be written off.

+ References

No definition available.

+ Details

Name:	nick_DelinquentAccountCriteriaPeriod
Namespace Prefix:	nick_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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:	duration

X

- Definition

Minimum threshold percentage of payment due for automobile contract to be delinquent.

+ References

No definition available.

+ Details

Name:	nick_MinimumThresholdPercentageOfPaymentDueForAutomobileContractToBeDelinquent
Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the number of days after which the receivable account is considered as non- performing account.

+ References

No definition available.

+ Details

Name:	nick_NonPerformingAccountCriteriaMinimumPeriod
Namespace Prefix:	nick_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the number of days before which the receivable account is considered as performing account.

+ References

No definition available.

+ Details

Name:	nick_PerformingAccountCriteriaMaximumPeriod
Namespace Prefix:	nick_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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