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Finance Receivables - Selected information on entire portfolio of Company (Details 1) - Contract	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Contract Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted APR	22.37%	22.24%
Weighted average discount	7.23%	7.32%
Weighted average term (months)	54 months	57 months
Number of active contracts	30,548	34,935
Direct Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted APR	25.14%	25.23%
Weighted average term (months)	32 months	33 months
Number of active contracts	2,458	2,721

X

- Definition

Represents number of active contracts.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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
Period Type:	duration

X

- Definition

Represents weighted average percent rate on the entire portfolio.

+ References

No definition available.

+ Details

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

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
Period Type:	duration

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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Namespace Prefix:	us-gaap_
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: