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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