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PROFIT SHARING PLAN (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
PROFIT SHARING PLAN |  |
Employee's maximum voluntary contribution as percentage of their compensation | 100.00% |
Percentage of employer's contribution matching first 4 percent of employee's compensation | 50.00% |
Percentage of first portion of employee's compensation eligible for employer's matching contribution | 4.00% |
Percentage of employer's contribution matching next 2 percent of employee's compensation | 100.00% |
Percentage of second portion of employee's compensation eligible for employer's matching contribution | 2.00% |
Maximum matching percentage of employee compensation | 4.00% |
Company's matching contributions to the profit sharing plan (net of employee forfeitures) | $ 0.7 | $ 0.7

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: | num: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
Name: | dit_DefinedContributionPlanEmployerMatchEmployeeContributionLevelTwo
Namespace Prefix: | dit_
Data Type: | num: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
Name: | dit_DefinedContributionPlanEmployerMatchLevelOne
Namespace Prefix: | dit_
Data Type: | num: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: | num: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
Name: | dit_DefinedContributionPlanMaximumEmployeeContributionAsPercentageOfCompensation
Namespace Prefix: | dit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | dit_ProfitSharingPlanDisclosureAbstract
Namespace Prefix: | dit_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration