Long-Term Debt - Convertible Sr Notes (Details) - 2.50% convertible senior notes - Senior Notes	3 Months Ended
	Dec. 31, 2023 USD ($) d $ / shares	Sep. 30, 2023 USD ($)	Aug. 12, 2022 USD ($)
Debt Instrument
Long-term Debt | $	$ 575,000,000.0	$ 575,000,000.0	$ 575,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Debt Instrument, Convertible, Conversion Ratio	9.4248
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 106.10
Debt Instrument, Convertible, Threshold Consecutive Trading Days | d	5
Debt Instrument, Convertible, Threshold Trading Days | d	10
Debt Instrument, Issued, Principal | $	$ 1,000
Debt Instrument, Convertible, Latest Date	Aug. 15, 2027
Debt Instrument, Convertible, Earliest Date	May 15, 2027
Maximum
Debt Instrument
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Minimum
Debt Instrument
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	98.00%