Stockholders' Equity - Schedule of Non-vested Restricted Stock Units (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
Time-Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested, Shares, Beginning balance	1,420,532
Non-vested, Shares, Granted	593,686
Non-vested, Shares, Vested	(917,483)
Non-vested, Shares, Forfeited	(71,666)
Non-vested, Shares, Ending balance	1,025,069
Performance-Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested, Shares, Beginning balance	654,619
Non-vested, Shares, Granted	301,239
Non-vested, Shares, Vested	(474,681)
Non-vested, Shares, Forfeited	(95,588)
Non-vested, Shares, Ending balance	385,589
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested, Shares, Beginning balance	2,075,151
Non-vested, Shares, Granted	894,925
Non-vested, Shares, Vested	(1,392,164)
Non-vested, Shares, Forfeited	(167,254)
Non-vested, Shares, Ending balance	1,410,658
Non-vested, Shares, Expected to vest	1,410,658
Non-vested, Weighted-Average Grant-Date Fair Value, Beginning balance | $ / shares	$ 44.20
Non-vested, Weighted-Average Grant-Date Fair Value, Granted | $ / shares	75.72
Non-vested, Weighted-Average Grant-Date Fair Value, Vested | $ / shares	59.71
Non-vested, Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	55.93
Non-vested, Weighted-Average Grant-Date Fair Value, Ending balance | $ / shares	64.64
Non-vested, Weighted-Average Grant-Date Fair Value, Expected to vest | $ / shares	$ 64.64
Non-vested, Weighted-Average Remaining Contractual Term (years), Expected to vest	1 year 1 month 13 days
Non-vested, Aggregate Intrinsic Value, Expected to vest | $	$ 50,911