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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Goodwill and Intangible Assets: |  |
Impairment of goodwill, indefinite-lived assets or identifiable intangible assets with finite lives | $ 0 | $ 0
Insurance |  |
Letter of credit issued for worker's compensation insurance carrier as part of the entity's self-insured loss control program | $ 0.4 |
Number of months of claims used to calculate the reserve for incurred, but not reported, employee health care benefits | 1 month |
Buildings |  |
Property and Equipment |  |
Estimated useful lives | 40 years |
Warehouse equipment | Minimum |  |
Property and Equipment |  |
Estimated useful lives | 5 years |
Warehouse equipment | Maximum |  |
Property and Equipment |  |
Estimated useful lives | 7 years |
Furniture, fixtures and leasehold improvements | Minimum |  |
Property and Equipment |  |
Estimated useful lives | 2 years |
Furniture, fixtures and leasehold improvements | Maximum |  |
Property and Equipment |  |
Estimated useful lives | 12 years |
Vehicles |  |
Property and Equipment |  |
Estimated useful lives | 5 years |

X
- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of goodwill, indefinite-lived assets or identifiable intangible assets with finite lives to fair value. + References No definition available. + Details
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Namespace Prefix: | dit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of months of claims used to calculate the reserve for incurred, but not reported, employee health care benefits. + References No definition available. + Details
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X
- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

X
- Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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X
- Details
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Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration