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Finance Receivables (Details 4) (USD $)	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2012 Finance receivables Direct Loans	Sep. 30, 2011 Finance receivables Direct Loans	Sep. 30, 2012 Finance receivables Contracts	Sep. 30, 2011 Finance receivables Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 396,859,826	$ 388,988,355	$ 8,075,902	$ 5,721,768	$ 388,783,924	$ 377,297,796
Delinquencies 31 to 60 days			94,770	22,229	15,310,139	10,934,539
Delinquencies 61 to 90 days			6,822	20,229	3,879,087	3,188,022
Delinquencies Over 90 days			11,024	15,558	1,739,015	1,041,238
Delinquencies Total			$ 112,616	$ 58,016	$ 20,928,241	$ 15,163,799
Finance Receivables 31 To 60 Days Past Due Delinquency Rate			1.17%	0.39%	3.94%	2.90%
Finance Receivables 61 To 90 Days Past Due Delinquency Rate			0.08%	0.35%	0.10%	0.84%
Finance Receivables Equal To Greater Than 90 Days Past Due Delinquency Rate			0.14%	0.27%	0.44%	0.28%
Financing Receivable Delinquency Rate Recorded Investment Past Due			1.39%	1.01%	5.38%	4.02%

X

- Definition

This item represents the delinquency rate of the finance receivables that are less than 60 days past due but more than 31 days past due.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the delinquency rate of the finance receivables that are less than 90 days past due but more than 61 days past due.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the delinquency rate of the finance receivables that are equal to or greater than 90 days past due.

+ References

No definition available.

+ Details

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X

- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date delinquency rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
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X

- Details

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Balance Type:	na
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X

- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524

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- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524

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- Definition

Financing receivables that are equal to or greater than 90 days past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524

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X

- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

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