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PROFIT SHARING PLAN: (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
PROFIT SHARING PLAN: |  |
Employee's maximum voluntary contribution as percentage of their compensation | 100.00% |
Percentage of employer's contribution matching first 4 percent of employee's compensation | 50.00% |
Percentage of first portion of employee's compensation eligible for employer's matching contribution | 4.00% |
Percentage of employer's contribution matching next 2 percent of employee's compensation | 100.00% |
Percentage of second portion of employee's compensation eligible for employer's matching contribution | 2.00% |
Maximum matching percentage of employee compensation | 4.00% |
Company's matching contributions to the profit sharing plan (net of employee forfeitures) | $ 0.6 | $ 0.6

X
- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | dit_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix: | dit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the second level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | dit_DefinedContributionPlanEmployerMatchEmployeeContributionLevelTwo
Namespace Prefix: | dit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the employer matching contribution of the first level of employee contributions. + References No definition available. + Details
Name: | dit_DefinedContributionPlanEmployerMatchLevelOne
Namespace Prefix: | dit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the employer matching contribution of the second level of employee contributions. + References No definition available. + Details
Name: | dit_DefinedContributionPlanEmployerMatchLevelTwo
Namespace Prefix: | dit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum percentage of employee compensation, by the terms of the plan, that the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | dit_DefinedContributionPlanMaximumEmployeeContributionAsPercentageOfCompensation
Namespace Prefix: | dit_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dit_ProfitSharingPlanDisclosureAbstract
Namespace Prefix: | dit_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -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. + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration