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Finance Receivables (Detail Textuals 1)	6 Months Ended
	Sep. 30, 2015
Finance receivables | Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of average wholesale value of automobile	97.00%

X

- Definition

This element represents the amount of the contract as a percentage of the average wholesale value of the automobile at the time of purchase.

+ References

No definition available.

+ Details

Name:	nick_AverageLoanToValueRatio
Namespace Prefix:	nick_
Data Type:	num:percentItemType
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

- Details

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

X

- Details

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