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v3.22.2.2

PROFIT SHARING PLANS (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 USD ($) plan | Sep. 30, 2021 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |
Number of profit sharing plans | plan | 2 |
Employee's maximum voluntary contribution as percentage of their compensation | 100.00% |
Company's matching contributions to the profit sharing plan (net of employee forfeitures) | $ 1.2 |
AMCON Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Percentage of employer's contribution matching first 2 percent of employee's compensation | 100.00% |
Percentage of first portion of employee's compensation eligible for employer's matching contribution | 2.00% |
Percentage of employer's contribution matching next 4 percent of employee's compensation | 50.00% |
Percentage of second portion of employee's compensation eligible for employer's matching contribution | 4.00% |
Maximum matching percentage of employee compensation | 4.00% |
Company's matching contributions to the profit sharing plan (net of employee forfeitures) |  | $ 1.0
Sledd Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Maximum matching percentage of employee compensation | 5.00% |
Team Sledd Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Employee matching contribution | 100.00% |

X
- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | dit_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix: | dit_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the second level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
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Namespace Prefix: | dit_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the employer matching contribution of the first level of employee contributions. + References No definition available. + Details
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Namespace Prefix: | dit_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the employer matching contribution of the second level of employee contributions. + References No definition available. + Details
Name: | dit_DefinedContributionPlanEmployerMatchLevelTwo
Namespace Prefix: | dit_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum percentage of employee compensation, by the terms of the plan, that the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | dit_
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of profit sharing plans. + References No definition available. + Details
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Namespace Prefix: | dit_
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Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Data Type: | dtr-types:percentItemType
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X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
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- Details
Name: | us-gaap_RetirementPlanTypeAxis=dit_AmconPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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