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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012
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 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
Name: | dit_NumberOfMonthsOfClaimsUsedToCalculateReserveForIncurredButNotYetReportedEmployeeHealthCareBenefits
Namespace Prefix: | dit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InsuranceAbstract
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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration