Stock-based Compensation - Schedule of RSU Activity (Details) - Restricted Stock Units (RSUs) shares in Thousands	6 Months Ended
	Mar. 31, 2023 $ / shares shares
Number of RSUs
Balance of outstanding RSUs, beginning, Shares | shares	2,754
Granted, shares | shares	1,202	[1]
Vested, Shares | shares	(1,184)
Forfeited or not earned, Shares | shares	(94)
Balance of outstanding RSUs, ending, Shares | shares	2,678
Weighted- Average Grant Date Fair Value Per RSU
Balance of outstanding RSUs, beginning (in USD per share) | $ / shares	$ 105.07
Granted (in USD per share) | $ / shares	127.59	[1]
Vested (in USD per share) | $ / shares	104.78
Forfeited or not earned (in USD per share) | $ / shares	112.24
Balance of outstanding RSUs, ending (in USD per share) | $ / shares	$ 115.07

[1] RSUs granted includes 38 thousand shares from prior period rTSR awards that were earned upon achievement of the performance criteria and vested in November 2022, and 61 thousand shares from prior period performance-based awards that were earned upon achievement of the performance criteria and vested in November 2022.