Earnings per Share - Schedule of antidilutive securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares excluded (in shares)	20,921	21,211	20,303	21,667
Dilutive shares under the as-converted method (in shares)	54,174	54,057	53,847	53,950
Outstanding stock-based grants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares excluded (in shares)	624	190	6	646
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares excluded (in shares)	20,297	21,021	20,297	21,021