Represents the amount of line of credit facility increased at each instances during the period.

No definition available.

Name:	cetx_IncreasedLineOfCreditFacility
Namespace Prefix:	cetx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion.

+ 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 210.5-02.22)
-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_LongTermLoansFromBank
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

+ Details

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

- Definition

Description of the contractual payment terms of the loan receivable including whether principal and interest is payable at a level or varying amount over the life of the loan, the amount of any balloon payment required at maturity, and any prepayment penalties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.5)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

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

- Definition

The aggregate amount of the participating mortgage obligation at the end of the accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=29639217&loc=d3e10013-112621

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cetx_LoanPayableToBankOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cetx_RobCemtrexGmbhAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cetx_RobCemtrexGmbhFundedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cetx_LoanPayableToBankTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cetx_LoanPayableToBankThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cetx_LoanPayableToBankFourMember
Namespace Prefix:
Data Type:	na
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Period Type:

LONG-TERM LIABILITIES (Details Textual)	1 Months Ended
LONG-TERM LIABILITIES (Details Textual)	May. 31, 2014 EUR (€)	Mar. 30, 2014 USD ($)	Oct. 31, 2013 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	May. 31, 2014 USD ($)	May. 31, 2014 EUR (€)	Mar. 30, 2014 EUR (€)	Oct. 31, 2013 EUR (€)
Debt Instrument [Line Items]
Loans Payable to Bank, Noncurrent				$ 2,383,815	$ 3,152,935
Loan payable to bank One [Member]
Debt Instrument [Line Items]
Loans Payable to Bank, Noncurrent			$ 4,006,500						€ 3,000,000
Debt Instrument, Interest Rate, Stated Percentage			4.95%						4.95%
Debt Instrument, Maturity Date			Oct. 30, 2021
Loan payable to bank One [Member] \| ROB Cemtrex GmbH Acquisition [Member]
Debt Instrument [Line Items]
Loans Payable to Bank, Noncurrent			$ 3,133,286
Loan payable to bank One [Member] \| ROB Cemtrex GmbH Funded Operations [Member]
Debt Instrument [Line Items]
Loans Payable to Bank, Noncurrent			873,214
Loan payable to bank Two [Member]
Debt Instrument [Line Items]
Loans Payable to Bank, Noncurrent			$ 1,335,500						€ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage			4.00%						4.00%
Increased Line Of Credit Facility \| €	€ 500,000
Line of Credit Facility, Increase (Decrease), Net \| €	€ 2,000,000
Loan Payable To Bank Three [Member]
Debt Instrument [Line Items]
Participating Mortgage Loans, Mortgage Obligations, Amount		$ 5,500,400						€ 4,000,000
Mortgage Loans on Real Estate, Interest Rate		3.00%
Mortgage Loans on Real Estate, Periodic Payment Terms		17 years
Loan Payable To Bank Four [Member]
Debt Instrument [Line Items]
Participating Mortgage Loans, Mortgage Obligations, Amount						$ 272,840	€ 200,000
Mortgage Loans on Real Estate, Interest Rate	4.50%
Mortgage Loans on Real Estate, Periodic Payment Terms	4 years