Finance Receivables (Detail Textuals 1) (Finance receivables, Contracts)	6 Months Ended
Sep. 30, 2013
Finance receivables \| Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of average wholesale value of automobile	93.00%

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

No definition available.

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