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Revenue Recognition (Detail Textuals) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013
Deferred Revenue Arrangement [Line Items]
Average dealer discount associated with new volume	8.35%	9.04%
Minimum term of suspension on finance receivables	60 days
Amount of gross finance receivables not accruing interest	$ 5,665,000		$ 4,132,000
Nicholas Data Services, Inc.
Deferred Revenue Arrangement [Line Items]
Percentage of revenues	1.00%

X

- Definition

Percentage of consolidated revenue generated from a single external customer that accounts for 10 percent or less of an entity's revenues.

+ References

No definition available.

+ Details

Name:	nick_EntityWideConsolidatedRevenueMajorCustomerPercentage
Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

It represents amount of gross finance receivables not accruing interest as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	nick_FinanceReceivablesGrossNotAccruingInterest
Namespace Prefix:	nick_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Maximum term of suspension of the interest on finance receivables.

+ References

No definition available.

+ Details

Name:	nick_MinimumTermOfSuspensionOnFinanceReceivables
Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
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

- Details

Name:	us-gaap_DeferredRevenueArrangementLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration