Represents the automatic renewal period of line of credit facility unless terminated by either the borrower or lender.

No definition available.

Name:	dit_LineOfCreditFacilityAutomaticRenewalPeriodOfAgreement
Namespace Prefix:	dit_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents fixed charge coverage ratio required to be maintained immediately after giving effect to any such dividend or distribution payments.

+ References

No definition available.

+ Details

Name:	dit_LineOfCreditFacilityDividendCovenantFixedChargeCoverageRatio
Namespace Prefix:	dit_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the restricted amount of dividends on common stock.

+ References

No definition available.

+ Details

Name:	dit_LineOfCreditFacilityDividendsRestrictionOnCommonStock
Namespace Prefix:	dit_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	dit_LineOfCreditFacilityFinancialCovenantExcessCapacityThresholdPercentageOfMaximumLoanLimit
Namespace Prefix:	dit_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	dit_LineOfCreditFacilityFinancialCovenantFixedChargeCoverageRatio
Namespace Prefix:	dit_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period considered for computing fixed charge coverage ratio.

+ References

No definition available.

+ Details

Name:	dit_LineOfCreditFacilityFinancialCovenantPeriodConsideredForComputingFixedChargeCoverageRatio
Namespace Prefix:	dit_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_LineOfCreditFacilityCapacityAvailableForTradePurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Line-of-Credit Arrangement

-URI http://asc.fasb.org/extlink&oid=6517033

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600

+ Details

Name:	us-gaap_LongTermLineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

DEBT: (Details) (USD $)			12 Months Ended						12 Months Ended
DEBT: (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Facility	Sep. 30, 2013 Facility LIBOR	Sep. 30, 2013 Facility Prime rate	Sep. 30, 2013 Facility Minimum	Sep. 30, 2013 Facility Minimum LIBOR	Sep. 30, 2013 Facility Maximum	Sep. 30, 2013 Facility Maximum LIBOR
Revolving credit facility
Revolving portion of the facility	$ 14,841,712	$ 14,353,732
Interest rate (as a percent)	2.14%
Revolving credit limit			70,000,000
Increase in borrowing capacity available under loan accordion			25,000,000
Additional credit advances for certain inventory purchases			$ 10,000,000
Automatic renewal period of agreement unless terminated			1 year
Notice period prior to the end of any original or renewal term of the agreement required for terminating the agreement either by the borrower or lender						90 days
Variable rate basis				LIBOR	Prime rate
Basis points added to reference rate (as a percent)							1.25%		1.75%
Unused commitment fee (as a percent)			0.25%
Fixed charge coverage ratio						1.0
Period considered for computing fixed charge coverage ratio			12 months
Threshold of excess availability of credit as a percentage of maximum loan limit, required for financial covenant compliance			10.00%
Restricted amount of dividends on common stock (in dollars per share)								$ 1.00
Fixed charge coverage ratio required to be maintained immediately after giving effect to any such dividend or distribution payments						1.10