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v3.19.3.a.u2

Finance Receivables (Detail Textuals 1) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum criteria for receivable to be a performing account |  |  | 61 days |
Percentage of more than payment contractually for delinquent |  |  | 10.00% |
Minimum criteria for receivable to be a non-performing account |  |  | 61 days |
Troubled debt restructuring allowance for credit losses |  |  |  | $ 774,000,000
Additional reserve for bankruptcy |  |  | $ 0 |
Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Criteria for receivable to be delinquent account | 181 days |  |  |
Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Criteria for receivable to be delinquent account | 121 days |  |  |
Non-performing accounts |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Charge-offs |  | $ 100,000 |  |
Bankruptcy |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Charge-offs |  | $ 1,500,000 |  |

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- Definition Additional reserve for bankruptcy warranted. + References No definition available. + Details
Name: | nick_AdditionalReserveForBankruptcyWarranted
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the number of days after which the receivable account is considered as delinquent account which will be written off. + References No definition available. + Details
Name: | nick_DelinquentAccountCriteriaPeriod
Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the number of days after which the receivable account is considered as non- performing account. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents percentage of payment contractually for delinquent. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the number of days before which the receivable account is considered as performing account. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents information about Troubled Debt Restructuring Allowance For Credit Losses. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Balance Type: |
Period Type: |