Stock-based Compensation - Schedule of RSU Activity (Details) - Restricted Stock Units (RSUs) shares in Thousands	9 Months Ended
	Jun. 30, 2022 $ / shares shares
Number of RSUs
Balance of outstanding restricted stock units, beginning, Shares | shares	3,217
Granted, shares | shares	1,609
Vested, Shares | shares	(1,728)
Forfeited or not earned, Shares | shares	(318)
Balance of outstanding restricted stock units, ending, Shares | shares	2,780
Weighted- Average Grant Date Fair Value Per RSU
Balance of outstanding restricted stock units, beginning (in USD per share) | $ / shares	$ 92.46
Granted (in USD per share) | $ / shares	114.18
Vested (in USD per share) | $ / shares	92.83
Forfeited or not earned (in USD per share) | $ / shares	98.55
Balance of outstanding restricted stock units, ending (in USD per share) | $ / shares	$ 104.93