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Stockholders' Equity - Share Repurchase Program (Details) - 2017 Share Repurchase program - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Aug. 31, 2017
Share Repurchase Program
Amount of shares authorized to be repurchased		$ 595,800,000		$ 595,800,000		$ 1,000,000,000.0
Stock repurchase program, expiration date	Sep. 30, 2025
Number of shares repurchased		0	0	0	6,800,000
Total cost of share repurchased					$ 130,300,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern 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.

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