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v3.19.3

Finance Receivables (Detail Textuals 1) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2019 | Sep. 30, 2019 | Sep. 30, 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 |  | $ 232,000 | $ 771,000
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 |  |

X
- 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

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

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

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

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

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |