Cash Investment Limit For Acquisition of Business

No definition available.

Name:	ptc_CashInvestmentLimitForAcquisitionOfBusiness
Namespace Prefix:	ptc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Component of Base Rate, Basis Spread on Adjusted LIBOR

+ References

No definition available.

+ Details

Name:	ptc_ComponentOfBaseRateBasisSpreadOnAdjustedLibor
Namespace Prefix:	ptc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Component of Base Rate, Basis Spread on Federal Reserve Bank of New York (FRBNY) rate

+ References

No definition available.

+ Details

Name:	ptc_ComponentofBaseRateBasisSpreadonFederalReserveBankofNewYorkFRBNYrate
Namespace Prefix:	ptc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Covenant, Interest Coverage Ratio, Minimum

+ References

No definition available.

+ Details

Name:	ptc_DebtCovenantInterestCoverageRatioMinimum
Namespace Prefix:	ptc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant Compliance, Leverage Ratio Four

+ References

No definition available.

+ Details

Name:	ptc_DebtInstrumentCovenantComplianceLeverageRatioFour
Namespace Prefix:	ptc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant Compliance, Senior Debt Leverage Ratio

+ References

No definition available.

+ Details

Name:	ptc_DebtInstrumentCovenantComplianceSeniorDebtLeverageRatio
Namespace Prefix:	ptc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant Compliance, Senior Debt Leverage Ratio, actual

+ References

No definition available.

+ Details

Name:	ptc_DebtInstrumentCovenantComplianceSeniorDebtLeverageRatioactual
Namespace Prefix:	ptc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest Coverage Ratio, Actual

+ References

No definition available.

+ Details

Name:	ptc_InterestCoverageRatioActual
Namespace Prefix:	ptc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Investment in Foreign Subsidiaries Authorized Amount

+ References

No definition available.

+ Details

Name:	ptc_InvestmentInForeignSubsidiariesAuthorizedAmount
Namespace Prefix:	ptc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Actual leverage ratio -- metric for determining compliance with debt covenant

+ References

No definition available.

+ Details

Name:	ptc_LeverageRatioActual
Namespace Prefix:	ptc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Variable Interest Rate, Length of Time Between Updates

+ References

No definition available.

+ Details

Name:	ptc_LineOfCreditFacilityVariableInterestRateLengthOfTimeBetweenUpdates
Namespace Prefix:	ptc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Maximum Borrowing Capacity Expansion Amount

+ References

No definition available.

+ Details

Name:	ptc_LineofCreditFacilityMaximumBorrowingCapacityExpansionAmount
Namespace Prefix:	ptc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Voting interest in foreign subsidiaries pledged against credit facility

+ References

No definition available.

+ Details

Name:	ptc_VotingInterestInForeignSubsidiariesPledgedAgainstCreditFacility
Namespace Prefix:	ptc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Voting interest in domestic subsidiaries pledged against credit facility

+ References

No definition available.

+ Details

Name:	ptc_Votinginterestindomesticsubsidiariespledgedagainstcreditfacility
Namespace Prefix:	ptc_
Data Type:	num:percentItemType
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 average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- 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

Amount of the required periodic payments applied to interest.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

+ Details

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

- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

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

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions 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://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
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 the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

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

- 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 cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

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

- Details

Name:	us-gaap_SubordinatedBorrowingAxis=ptc_ForeignSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ptc_RevolvingLoanResetPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Credit Agreement - Additional Information (Details) - USD ($)	3 Months Ended			12 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Nov. 25, 2020	Nov. 13, 2019
Debt Instrument [Line Items]
Credit facility amount								$ 1,000,000,000
Voting interest in domestic subsidiaries pledged against credit facility				100.00%
Voting interest in foreign subsidiaries pledged against credit facility				65.00%
Leverage ratio, actual				2.34
Senior debt leverage ratio, actual				0.08
Fixed charge coverage ratio, actual				5.85
Financing costs				$ 17,107,000	$ 0	$ 2,851,000
Interest expense				76,400,000	43,000,000.0	41,700,000
Periodic interest payment				$ 60,600,000	$ 40,800,000	$ 39,800,000
Amount paid in penalties for the early redemption of the 2024 notes	$ 15,000,000.0
Interest rate during period				4.30%	5.40%	5.20%
Foreign Subsidiary \| Subsequent Event
Debt Instrument [Line Items]
Long-term portion of long term debt							$ 0
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity expansion amount								$ 500,000,000
Unused commitments under credit facility				$ 982,000,000.0
Credit facility maturity date				Feb. 13, 2025
Basis spread on Federal Reserve Bank of New York (FRBNY) rate				0.50%
Basis spread on adjusted LIBOR				1.00%
Investment limit in foreign subsidiaries				$ 100,000,000
Cash investment limit for acquisition of business				$ 200,000,000
Total leverage ratio				4.50
Senior secured leverage ratio				3.00
Minimum fixed charge coverage ratio allowed under debt covenant				3.00
Financing costs		$ 2,000,000.0	$ 1,000,000.0
Line of Credit \| Minimum
Debt Instrument [Line Items]
Variable interest rate, length of time between updates				30 days
Credit facility commitment fees percentage				0.175%
Line of Credit \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate				1.25%
Line of Credit \| Minimum \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				0.25%
Line of Credit \| Maximum
Debt Instrument [Line Items]
Variable interest rate, length of time between updates				180 days
Credit facility commitment fees percentage				0.30%
Line of Credit \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate				1.75%
Line of Credit \| Maximum \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				0.75%
Secured Debt \| Revolving Loan, Reset Period One
Debt Instrument [Line Items]
Interest rate at period end				1.81%