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v3.21.2

DEBT - Cross Default and Co-Terminus Provisions and Other (Details) $ in Millions | 9 Months Ended
--- | ---
Jun. 30, 2021 USD ($) item
Debt Instrument [Line Items] |
Letter of credit issued for worker's compensation insurance carrier as part of the entity's self-insured loss control program | $ | $ 0.5
3.625% Real Estate Loan |
Debt Instrument [Line Items] |
Number of cross defaults | item | 0

X
- Definition Represents the number of loans in default with the participant lender that will cause all loans with the participant lender to be in default. + References No definition available. + Details
Name: | dit_DebtInstrumentCrossDefaultProvisionNumberOfLoansInDefaultInParticipantLenderToCauseAllLoansWithParticipantLenderToBeInDefault
Namespace Prefix: | dit_
Data Type: | xbrli:integerItemType
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
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=dit_NotesPayableToBanks3.625PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |