XML 102 R59.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Income Taxes (Summary Of Valuation Allowance) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Valuation allowance beginning of year |  | $ 235,503 | $ 198,200 | $ 177,500
Net release of valuation allowance | [1] | (9,100) | (3,100) | (18,700)
Net increase in deferred tax assets for foreign jurisdictions with a full valuation allowance |  | 53,300 | 39,800 | 39,400
Establish valuation allowance in foreign jurisdictions |  | 0 | 600 | 0
Valuation allowance end of year |  | $ 279,683 | $ 235,503 | $ 198,200
[1] | In 2017 and 2016, this is attributable to the release in foreign jurisdictions. In 2015, this is attributable to a reduction in deferred tax assets associated with our U.S. pension plan

X
- Definition Valuation Allowance, Establishment in Foreign Jurisdictions + References No definition available. + Details
Name: | pmtc_ValuationAllowanceEstablishmentInForeignJurisdictions
Namespace Prefix: | pmtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Valuation allowance, net increase in deferred tax assets for foreign jurisdictions with a full valuation allowance + References No definition available. + Details
Name: | pmtc_ValuationAllowanceNetIncreaseInDeferredTaxAssetsForForeignJurisdictionsWithFullValuationAllowance
Namespace Prefix: | pmtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Valuation allowance, Release of valuation allowance + References No definition available. + Details
Name: | pmtc_ValuationAllowanceReleaseOfValuationAllowance
Namespace Prefix: | pmtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInValuationAllowancesAndReservesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration