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Summary of Significant Accounting Policies (Detail Textuals 2) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Accounting Policies [Abstract] |  |  |
Unearned interest, dealer discounts and allowance for credit losses | $ 169,071,000 nick_DeferredDiscountsInterestAndAllowanceForCreditLossesIncludedInFinancialReceivables | $ 155,001,000 nick_DeferredDiscountsInterestAndAllowanceForCreditLossesIncludedInFinancialReceivables |
Average dealer discount associated with new volume | 8.08%nick_PercentageOfReceivableInterestDiscount | 8.44%nick_PercentageOfReceivableInterestDiscount | 8.54%nick_PercentageOfReceivableInterestDiscount
Sales of NDS to the Company's consolidated revenues | less than 1% |  |
Cash paid for income taxes | 7,304,000 us-gaap_IncomeTaxesPaid | 10,837,000 us-gaap_IncomeTaxesPaid | 11,273,000 us-gaap_IncomeTaxesPaid
Cash paid for interest, including debt origination costs | $ 6,124,000 us-gaap_InterestPaidNet | $ 5,673,000 us-gaap_InterestPaidNet | $ 5,043,000 us-gaap_InterestPaidNet

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- Definition Represents unearned interest, discounts and allowance of credit losses included in the face amount of finance receivables, that are shown as a deduction from the related receivables. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- Definition Represents the revenue of wholly owned subsidiary as compared to the consolidated revenue of holding company. + References No definition available. + Details
Name: | nick_PercentageOfRevenueOfSubsidiaryToHoldingCompanyRevenue
Namespace Prefix: | nick_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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Data Type: | xbrli:monetaryItemType
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