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Accelerated Share Repurchase (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 17, 2021	Aug. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Payments for Repurchase of Common Stock				$ 874,179	$ 235,223	$ 228,894
Accelerated Share Repurchase Agreement Percentage	80.00%
Accelerated Share Repurchases Agreement Amount	$ 200,000
June17 2021 Accelerated share repurchase agreement
Equity, Class of Treasury Stock [Line Items]
Payments for Repurchase of Common Stock	$ 200,000
Stock Repurchased and Retired During Period, Shares		70,127	319,400	389,527
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 40,000

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The cash outflow to reacquire common stock during the period.

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