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Summary of Significant Accounting Policies (Detail Textuals) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Accounting Policies [Abstract] |  |  |
Unearned interest, dealer discounts and allowance for credit losses | $ 164.0 | $ 195.5 |
Period for maintaining historical write off information with respect to static pool | 10 years |  |
Percentage of liquidation level assist in determining allowance for credit losses | 20.00% |  |
Percentage of liquidation level assist in determining allowance for credit losses | 40.00% |  |
Percentage of liquidation level assist in determining allowance for credit losses | 60.00% |  |
Percentage of liquidation level assist in determining allowance for credit losses | 80.00% |  |
Percentage of liquidation level assist in determining allowance for credit losses | 100.00% |  |
Percentage of allowances increased of principal amount | 50.00% |  |
Average dealer discount associated with new volume | 7.41% | 7.08% | 7.51%

X
- 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
Name: | nick_DeferredDiscountsInterestAndAllowanceForCreditLossesIncludedInFinancialReceivables
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents percentage of allowances increased of principal amount . + References No definition available. + Details
Name: | nick_PercentageOfAllowancesIncreasedOfPrincipalAmount
Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents Percentage of liquidation level assist in determining allowance for credit losses. + References No definition available. + Details
Name: | nick_PercentageOfLiquidationLevelAssistInDeterminingAllowanceForCreditLosses
Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents Percentage of liquidation level assist in determining allowance for credit losses. + References No definition available. + Details
Name: | nick_PercentageOfLiquidationLevelAssistInDeterminingAllowanceForCreditLossesFour
Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents Percentage of liquidation level assist in determining allowance for credit losses . + References No definition available. + Details
Name: | nick_PercentageOfLiquidationLevelAssistInDeterminingAllowanceForCreditLossesOne
Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents Percentage of liquidation level assist in determining allowance for credit losses. + References No definition available. + Details
Name: | nick_PercentageOfLiquidationLevelAssistInDeterminingAllowanceForCreditLossesThree
Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents Percentage of liquidation level assist in determining allowance for credit losses. + References No definition available. + Details
Name: | nick_PercentageOfLiquidationLevelAssistInDeterminingAllowanceForCreditLossesTwo
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 Period for maintaining historical write off information with respect to static pool. + References No definition available. + Details
Name: | nick_PeriodForMaintainingHistoricalWriteOffInformationWithRespectToStaticPool
Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration