Stock-Based Compensation - Restricted Stock Unit Activity - Tabular Disclosure (Details) - Restricted Stock Units (RSUs) - $ / shares	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Shares
Outstanding at beginning of period (in shares)			1,088,652
Restricted stocks granted (in shares)			231,696	346,172
Vested (in shares)			(555,513)
Forfeited (in shares)			(223,821)
Outstanding at end of period (in shares)	541,014		541,014
Weighted Average Grant-Date Fair Value
Outstanding at beginning of period (in dollars per share)			$ 47.35
Granted (in dollars per share)	$ 80.58	$ 104.54	103.00	$ 71.81
Vested (in dollars per share)			41.50
Forfeited (in dollars per share)			39.51
Outstanding at end of period (in dollars per share)	$ 93.96		$ 93.96