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Revenue Recognition (Detail Textuals)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue Recognition and Deferred Revenue [Abstract]
Interest income accrual on finance receivables suspension condition			Accrual of interest income on finance receivables is suspended when a loan enters bankruptcy status, is contractually delinquent for 61 days or more, or the collateral is repossessed, whichever is earlier. Chapter 13 bankruptcy accounts are accounted for under the cost-recovery method.
Average dealer discount associated with new volume	8.42%	7.27%	8.36%	7.41%

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- Definition

Represents accrual of interest income on finance receivables suspension condition.

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No definition available.

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- Definition

This element represents the percentage of finance receivable interest discount.

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No definition available.

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Name:	nick_PercentageOfReceivableInterestDiscount
Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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No definition available.

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