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CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY |  |
Dividends on common stock | $ 1.00 | $ 1.00

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- Definition Aggregate special dividends declared per share of common stock. + References No definition available. + Details
Name: | dit_SpecialDividendsDeclaredOnCommonStock
Namespace Prefix: | dit_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration