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Finance Receivables - Selected information on entire portfolio of Company (Details 1) - Contract	9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Contract Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted APR	22.21%	22.43%
Weighted average discount	7.25%	7.48%
Weighted average term (months)	57 months	57 months
Number of active contracts	33,993	37,834
Direct Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted APR	25.18%	25.69%
Weighted average term (months)	33 months	33 months
Number of active contracts	2,718	3,023

X

- Definition

Represents number of active contracts.

+ References

No definition available.

+ Details

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X

- Definition

Represents weighted average discount rate on the entire portfolio.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Represents weighted average percent rate on the entire portfolio.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
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Balance Type:	na
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X

- Definition

Represents weighted average term on the entire portfolio.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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