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Description of Business and Basis of Presentation	12 Months Ended
Description of Business and Basis of Presentation	Sep. 30, 2017
Description Of Business And Basis Of Presentation [Abstract]
Description of Business and Basis Of Presentation	Description of Business and Basis of Presentation Business PTC Inc. was incorporated in 1985 and is headquartered in Needham, Massachusetts. PTC is a global software and services company that delivers a technology platform and solutions to help companies design, manufacture, operate, and service things for a smart, connected world. Basis of Presentation Our fiscal year-end is September 30. The consolidated financial statements include PTC Inc. (the parent company) and its wholly owned subsidiaries, including those operating outside the U.S. All intercompany balances and transactions have been eliminated in the consolidated financial statements. In 2015, we recorded an out of period correction of approximately $6.4 million of additional revenue that was deferred and should have been recognized previously. Management believes this correction was not material to the then current period financial statements or any previously issued financial statements. We prepare our financial statements under generally accepted accounting principles in the U.S. that require management to make estimates and assumptions that affect the amounts reported and the related disclosures. Actual results could differ from these estimates. Reclassifications Effective with the beginning of the third quarter of 2017, we are reporting cost of license and subscription revenue separately from cost of support revenue and are presenting cost of revenue in three categories: 1) cost of license and subscription revenue, 2) cost of support revenue, and 3) cost of professional services revenue. Cost of license and subscription includes the cost of perpetual and subscription licenses; cost of support includes the cost of supporting both perpetual and subscription licenses. Costs of revenue for previous periods in the accompanying Consolidated Statements of Operations are presented on a basis consistent with the current period presentation.