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Finance Receivables (Detail Textuals 1) (Finance receivables, Contracts) | 12 Months Ended
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Mar. 31, 2014
Finance receivables | Contracts |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of average wholesale value of automobile | 94.00%

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