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Finance Receivables (Details Textuals 1)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average dealer discount associated with new volume	7.92%	8.41%	7.85%	8.46%
Finance receivables | Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of average wholesale value of automobile			92.00%
Percentage of amount retained under Static pool approach of the discount as a reserve for credit losses			100.00%

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

This element represents the percentage of finance receivable interest discount.

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the percentage of the discount as a reserve for credit losses which is retained in the static pool approach.

+ References

No definition available.

+ Details

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

X

- Details

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