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DEBT (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 9 Months Ended
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Jun. 30, 2012 item
Revolving credit facility |
Number of loans in default with participant lender that will cause all loans with participant lender to be in default | 1
Letter of credit issued for worker's compensation insurance carrier as part of the entity's self-insured loss control program | $ 0.4
Facility |
Revolving credit facility |
Revolving credit limit | 70.0
Increase in borrowing capacity available under loan accordion | 25.0
Additional credit advances for certain inventory purchases | $ 5.0
Automatic renewal period of agreement unless terminated (in years) | 1 year
Prepayment penalty in year one of the agreement (as a percent) | 0.50%
Prepayment penalty in year two of the agreement (as a percent) | 0.25%
Unused commitment fee (as a percent) | 0.25%
Period considered for computing fixed charge coverage ratio (in months) | 12 months
Threshold of excess availability of credit as a percentage of maximum loan limit, as it relates to requiring a fixed charge ratio | 10.00%
Facility | Maximum |
Revolving credit facility |
Restricted amount of dividends on common stock (in dollars per share) | $ 1.00
Facility | Minimum |
Revolving credit facility |
Notice period prior to the end of the original term of the agreement or the end of any renewal period required for terminating the agreement either by the borrower or lender (in days) | 90 days
Fixed charge coverage ratio | 1.1
Facility | LIBOR |
Revolving credit facility |
Variable rate basis | LIBOR
Basis points added to reference rate (as a percent) | 1.75%

X
- Definition Represents the number of loans in default with the participant lender that will cause all loans with the participant lender to be in default. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the automatic renewal period of line of credit facility unless terminated by either the borrower or lender. + References No definition available. + Details
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Namespace Prefix: | dit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the restricted amount of dividends on common stock. + References No definition available. + Details
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Namespace Prefix: | dit_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the threshold of excess availability of credit expressed as a percentage of maximum loan limit, as it relates to requiring a fixed charge ratio. + References No definition available. + Details
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Namespace Prefix: | dit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents fixed charge coverage ratio required to be maintained during any previous twelve month period if excess capacity falls below a defined threshold per the terms of the credit agreement. + References No definition available. + Details
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Namespace Prefix: | dit_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period considered for computing fixed charge coverage ratio. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase in borrowing capacity available under the credit facility attributable to the accordion feature. + References No definition available. + Details
Name: | dit_LineOfCreditFacilityIncreaseAvailableAccordionFeature
Namespace Prefix: | dit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the period of time prior to the end of the original term of the agreement or the end of any renewal period in which either the borrower or lender may terminate the line of credit facility. + References No definition available. + Details
Name: | dit_LineOfCreditFacilityNoticePeriodForTerminatingAgreement
Namespace Prefix: | dit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent the penalty, expressed as a percentage of the maximum loan limit, imposed by a lender of the line of credit facility if the borrower makes prepayment of the sum borrowed or terminates the facility in year one of the agreement. + References No definition available. + Details
Name: | dit_LineOfCreditFacilityPrepaymentPenaltyAsPercentageOfOriginalLoanAmountDuringYearOneOfAgreement
Namespace Prefix: | dit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent the penalty, expressed as a percentage of the maximum loan limit, imposed by a lender of the line of credit facility if the borrower makes prepayment of the sum borrowed or terminates the facility in year two of the agreement. + References No definition available. + Details
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Namespace Prefix: | dit_
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Balance Type: | na
Period Type: | duration

X
- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Period Type: | instant

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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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
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for financing purchases of goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

X
- Details
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Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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