Stockholders' Equity - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Oct. 01, 2024
Class of Stock [Line Items]
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, shares authorized	500,000,000	500,000,000
Stock repurchased during period (in shares)	1,650,000	0	0
Stock repurchased during period, value	$ 300.0
Maximum
Class of Stock [Line Items]
Common stock, shares authorized	500,000,000
Stock authorized to repurchase				$ 2,000.0
Series A Junior Participating Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized	500,000

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.

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+ Details

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details

PTC INC. 10-K