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EQUITY-BASED INCENTIVE AWARDS (Details 2) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Oct. 31, 2012
Oct. 31, 2013
Dec. 31, 2014
All Equity-Based Awards (stock options and restricted stock units)              
Compensation expense related to the amortization of all equity - based compensation awards $ 300,000us-gaap_AllocatedShareBasedCompensationExpense $ 400,000us-gaap_AllocatedShareBasedCompensationExpense $ 600,000us-gaap_AllocatedShareBasedCompensationExpense $ 700,000us-gaap_AllocatedShareBasedCompensationExpense      
Total unamortized compensation expense 2,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized 2,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized 2,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized 2,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Restricted Stock Units              
Restricted stock units              
Award outstanding at the end of the period (in shares) 29,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
  29,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Direct cost to the recipients of the restricted stock units     0dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDirectCostApplicableToRecipients
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Number of Shares              
Nonvested restricted stock units at the beginning of the period (in shares)     32,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
      32,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Granted (in shares)     13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Vested (in shares)     (15,923)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Nonvested restricted stock units at the end of the period (in shares) 29,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
  29,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Weighted Average Fair Value              
Nonvested restricted stock units at the beginning of the period (in dollars per share)     $ 84.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
      $ 84.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Granted (in dollars per share)     $ 83.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Vested (in dollars per share)     $ 82.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Nonvested restricted stock units at the end of the period (in dollars per share) $ 80.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
  $ 80.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Restricted Stock Units 1              
Restricted stock units              
Service period         36 months    
Estimated fair value of award at grant date         935,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodEstimatedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
   
Award outstanding at the end of the period (in shares) 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
  5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
       
Fair value of non-vested awards at the end of the period 402,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
  402,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
       
Vested as of the balance sheet date (in shares) 10,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVested
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
  10,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVested
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
       
Number of Shares              
Granted (in shares)         15,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
   
Nonvested restricted stock units at the end of the period (in shares) 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
  5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU1Member
       
Restricted Stock Units 2              
Restricted stock units              
Estimated fair value of award at grant date           1,486,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodEstimatedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
 
Award outstanding at the end of the period (in shares) 11,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
  11,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
       
Fair value of non-vested awards at the end of the period 963,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
  963,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
       
Vested as of the balance sheet date (in shares) 5,623dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVested
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
  5,623dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVested
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
       
Number of Shares              
Granted (in shares)           17,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
 
Nonvested restricted stock units at the end of the period (in shares) 11,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
  11,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
       
Restricted Stock Units 2 | Vesting of awards equally in two anniversaries from the date of grant              
Restricted stock units              
Award outstanding at the end of the period (in shares) 9,337us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInTwoAnniversariesFromDateOfGrantMember
  9,337us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInTwoAnniversariesFromDateOfGrantMember
       
Number of Shares              
Nonvested restricted stock units at the end of the period (in shares) 9,337us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInTwoAnniversariesFromDateOfGrantMember
  9,337us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInTwoAnniversariesFromDateOfGrantMember
       
Restricted Stock Units 2 | Vesting equally in four anniversaries from date of grant member              
Restricted stock units              
Award outstanding at the end of the period (in shares) 2,640us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInFourAnniversariesFromDateOfGrantMember
  2,640us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInFourAnniversariesFromDateOfGrantMember
       
Number of Shares              
Nonvested restricted stock units at the end of the period (in shares) 2,640us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInFourAnniversariesFromDateOfGrantMember
  2,640us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU2Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInFourAnniversariesFromDateOfGrantMember
       
Restricted Stock Units 2 | Minimum              
Restricted stock units              
Service period           36 months  
Restricted Stock Units 2 | Maximum              
Restricted stock units              
Service period           60 months  
Restricted Stock Units 3              
Restricted stock units              
Service period             36 months
Estimated fair value of award at grant date             1,083,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodEstimatedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
Award outstanding at the end of the period (in shares) 13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
  13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
       
Fair value of non-vested awards at the end of the period $ 1,045,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
  $ 1,045,000dit_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
       
Number of Shares              
Granted (in shares)             13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
Nonvested restricted stock units at the end of the period (in shares) 13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
  13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
       
Restricted Stock Units 3 | Vesting of awards equally in three anniversaries from the date of grant              
Restricted stock units              
Award outstanding at the end of the period (in shares) 13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInThreeAnniversariesFromDateOfGrantMember
  13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInThreeAnniversariesFromDateOfGrantMember
       
Number of Shares              
Nonvested restricted stock units at the end of the period (in shares) 13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInThreeAnniversariesFromDateOfGrantMember
  13,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= dit_RestrictedStockUnitsRSU3Member
/ us-gaap_VestingAxis
= dit_VestingEquallyInThreeAnniversariesFromDateOfGrantMember