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Fair Value Disclosures (Detail Textuals) | 12 Months Ended
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Mar. 31, 2013
Contracts | Minimum |
Financial Instruments Not Measured At Fair Value [Line Items] |
Initial term of the indirect finance receivables | 12 months
Contracts | Maximum |
Financial Instruments Not Measured At Fair Value [Line Items] |
Initial term of the indirect finance receivables | 72 months
Direct Loans | Minimum |
Financial Instruments Not Measured At Fair Value [Line Items] |
Initial term of the direct finance receivables | 6 months
Direct Loans | Maximum |
Financial Instruments Not Measured At Fair Value [Line Items] |
Initial term of the direct finance receivables | 48 months

X
- Details
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Namespace Prefix: | nick_
Data Type: | xbrli:stringItemType
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Period Type: | duration

X
- Definition This item represents initial term of direct finance receivables. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
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X
- Definition This item represents initial term of indirect finance receivables. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration