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Debt and Credit Facilities - Additional Information (Details)		1 Months Ended					3 Months Ended			6 Months Ended		9 Months Ended
	Jan. 01, 2024 USD ($)	Jun. 30, 2025 USD ($) Extension	Feb. 29, 2024 USD ($) d $ / shares	Sep. 30, 2022 USD ($)	Jun. 30, 2021 USD ($) Extension	Aug. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2025 USD ($) d $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding amount							$ 354,300,000					$ 354,300,000		$ 328,400,000
Tax effect of unwind existing bond hedge							11,375,000					11,375,000		7,701,000
Deferred tax liabilities							17,665,000					17,665,000		11,043,000
Effective tax rate and tax benefit													$ 4,300,000
Deferred tax assets							106,921,000					106,921,000		$ 133,450,000
Convertible debt repurchase loss	$ (18,400,000)											0	(18,355,000)
2022 Delayed Draw Term Loan
Debt Instrument [Line Items]
Debt issuance costs incurred							900,000					900,000
Interest rate		5.60%								5.60%				5.60%
Interest expense							$ 0	$ 5,900,000				$ 8,200,000	17,700,000
Debt instrument, outstanding amount														$ 350,000,000
Debt amount				$ 350,000,000
Maturity Date				Jun. 30, 2025
Debt issuance date				Sep. 30, 2022
Debt instrument, maturity period				3 years
Unused term loan commitments rate				0.175%
Term Loan
Debt Instrument [Line Items]
Debt issuance costs incurred		$ 900,000								$ 900,000
Interest rate							5.30%					5.30%
Interest expense							$ 6,400,000					$ 8,100,000
Debt instrument, outstanding amount							450,000,000					450,000,000
Debt amount		$ 450,000,000								450,000,000
Debt issuance date		Jun. 30, 2025
Debt instrument, maturity period		3 years
ASU 2024-04
Debt Instrument [Line Items]
Convertible debt repurchase loss													(18,355,000)
Delayed Draw Term Loan Due 2025
Debt Instrument [Line Items]
Terminated debt		$ 350,000,000
Debt instrument, outstanding amount							0					0		350,000,000
Term Loan Due 2028
Debt Instrument [Line Items]
Debt instrument, outstanding amount							450,000,000					450,000,000		0
Debt amount		450,000,000								450,000,000
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Interest rate						0.25%
Interest expense							40,000.00	100,000				$ 200,000	3,800,000
Debt amount						$ 400,000,000
Exercise of option by initial purchasers aggregate principal amount						50,000,000
Proceeds from issuance and sale of debt						389,700,000
Transaction fees and other third-party offering expenses						$ 10,300,000
Debt instrument, payment terms												The Convertible Senior Notes accrued interest at a rate of 0.25% per annum, payable semi-annually on February 15 and August 15 of each year beginning on February 15, 2021. The Convertible Senior Notes due 2025
Debt instrument, frequency of periodic payment												semi-annually
Maturity Date						Aug. 15, 2025
Net carrying value of notes							0					$ 0		113,400,000
Convertible Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate			2.625%
Interest expense							6,300,000	$ 6,300,000				18,900,000	$ 15,000,000
Debt amount			$ 800,000,000
Exercise of option by initial purchasers aggregate principal amount			100,000,000
Proceeds from issuance and sale of debt			781,100,000
Transaction fees and other third-party offering expenses			$ 18,900,000
Debt instrument, payment terms			The 2029 Convertible Notes accrue interest at a rate of 2.625% per annum, payable semi-annually on March 1 and September 1 of each year beginning on September 1, 2024
Debt instrument, frequency of periodic payment			semi-annually
Maturity Date			Mar. 01, 2029
Convertible note converted each amount							$ 1,000					$ 1,000
Convertible notes converted each into shares of common stock | shares												10.6256
Debt Instrument, conversion price | $ / shares							$ 94.11					$ 94.11
Threshold trading days | d			20									51
Threshold consecutive trading days | d			30
Conversion percentage of stock price trigger			130.00%
Number of business day period			5 days
Consecutive trading day period			5 days
Convertible principal amount			$ 1,000
Measurement period, percentage			98.00%
Percentage of principal amount to redeem convertible senior notes			100.00%
Percentage of convertible senior notes repurchased at cash			100.00%
Net carrying value of notes							$ 787,500,000					$ 787,500,000		$ 784,300,000
Maximum | 2022 Delayed Draw Term Loan
Debt Instrument [Line Items]
Increase in term loan				$ 150,000,000
Maximum | Term Loan
Debt Instrument [Line Items]
Increase in term loan		$ 150,000,000
Convertible Note Hedge And Warrant Transaction
Debt Instrument [Line Items]
Tax effect of unwind existing bond hedge							$ 46,200,000					46,200,000
Convertible Note Hedge And Warrant Transaction | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Purchase of convertible senior notes			$ 228,100,000
Proceeds from issuance and sale of debt												$ 391,800,000
Bond hedge term												5 years
Number of shares issuable upon conversion | shares						8,900,000
Cost of convertible note hedge transaction						$ 55,000,000
Number of common stock acquired by offsetting sale warrants. | shares												8,900,000
Exercise price of warrants | $ / shares							$ 66.46					$ 66.46
Proceeds from issuance of warrants												$ 13,800,000
Purchase of bond hedges and sale of warrants						$ 41,200,000
Deferred tax liabilities							$ 16,200,000					16,200,000
Deferred tax assets							16,500,000					16,500,000
Convertible Note Hedge And Warrant Transaction | Convertible Senior Notes Due 2025 | ASC 2020-06
Debt Instrument [Line Items]
Deferred tax liability reversed							13,900,000					13,900,000
Additional deferred tax liability related to capitalized debt issuance costs							400,000					400,000
Adjustment to deferred tax asset through retained earnings							$ 900,000					900,000
Convertible Note Hedge And Warrant Transaction | Convertible Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate								0.25%	0.25%				0.25%
Acceleration charge of amortization of debt issuance costs													$ 3,200,000
Effective tax rate and tax benefit									$ 49,900,000
Convertible debt repurchase loss													(18,400,000)
Convertible Note Hedge And Warrant Transaction | Convertible Senior Notes due 2025 | ASU 2024-04
Debt Instrument [Line Items]
Loss on extinguishment of debt									$ 211,000,000
Convertible Note Hedge And Warrant Transaction | Convertible Senior Notes Due 2025 Note Hedge And Warrants
Debt Instrument [Line Items]
Purchase of convertible senior notes			56,500,000
Proceeds from issuance and sale of debt												$ 103,800,000
Proceeds from partial termination of note hedge and warrants			90,600,000
Convertible Note Hedge And Warrant Transaction | Minimum | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Debt Instrument, conversion price | $ / shares						$ 44.86
Percentage of bond hedge and warrant transactions increased conversion price						35.00%
Convertible Note Hedge And Warrant Transaction | Maximum | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Debt Instrument, conversion price | $ / shares						$ 66.46
Percentage of bond hedge and warrant transactions increased conversion price						100.00%
Capped Call Transaction
Debt Instrument [Line Items]
Deferred tax assets			$ 22,300,000
Capped Call Transaction | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Debt Instrument, conversion price | $ / shares			$ 131.7575
Premium of reported sale price percentage			75.00%
Convertible Notes Converted Sale Price Of Common Stock | $ / shares			$ 75.29
Cost of convertible note hedge transaction			$ 88,400,000
Base Rate | Minimum | 2022 Delayed Draw Term Loan
Debt Instrument [Line Items]
Margin interest rate				0.00%
Base Rate | Minimum | Term Loan
Debt Instrument [Line Items]
Margin interest rate		0.00%
Base Rate | Maximum | 2022 Delayed Draw Term Loan
Debt Instrument [Line Items]
Margin interest rate				0.50%
Base Rate | Maximum | Term Loan
Debt Instrument [Line Items]
Margin interest rate		0.50%
SOFR Benchmark Rate | Minimum | 2022 Delayed Draw Term Loan
Debt Instrument [Line Items]
Margin interest rate				0.875%
SOFR Benchmark Rate | Minimum | Term Loan
Debt Instrument [Line Items]
Margin interest rate		0.875%
SOFR Benchmark Rate | Maximum | 2022 Delayed Draw Term Loan
Debt Instrument [Line Items]
Margin interest rate				1.50%
SOFR Benchmark Rate | Maximum | Term Loan
Debt Instrument [Line Items]
Margin interest rate		1.50%
Revolving Credit Facility due 2030
Debt Instrument [Line Items]
Credit agreement date		Jun. 30, 2025
Revolving credit facility		$ 750,000,000								750,000,000
Debt issuance costs incurred		1,700,000								1,700,000
Revolving credit facility		$ 650,000,000								$ 650,000,000
Credit agreement maturity period		5 years
Credit agreement number of extensions | Extension		2
Interest rate							5.40%					5.40%
Letters of credit outstanding amount							$ 41,800,000					$ 41,800,000
Interest expense							100,000	$ 100,000				600,000	600,000
Revolving Credit Facility due 2030 | Base Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate										0.00%
Revolving Credit Facility due 2030 | Base Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate										0.625%
Revolving Credit Facility due 2030 | SOFR Benchmark Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate		1.00%
Revolving Credit Facility due 2030 | SOFR Benchmark Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate		1.625%
Revolving Credit Facility due 2026
Debt Instrument [Line Items]
Credit agreement date					Jun. 30, 2021
Credit agreement termination date					Jun. 30, 2025
Revolving credit facility					$ 650,000,000						$ 650,000,000
Terminated debt		$ 650,000,000
Debt issuance costs incurred					1,900,000						1,900,000
Revolving credit facility					$ 550,000,000						$ 550,000,000
Credit agreement maturity period					5 years
Credit agreement number of extensions | Extension					2
Interest rate		5.70%								5.70%				5.70%
Letters of credit outstanding amount														$ 43,000,000
Interest expense							$ 100,000	$ 100,000				$ 600,000	$ 600,000
Revolving Credit Facility due 2026 | Base Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate											0.00%
Revolving Credit Facility due 2026 | Base Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate											0.625%
Revolving Credit Facility due 2026 | SOFR Benchmark Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate					1.00%
Revolving Credit Facility due 2026 | SOFR Benchmark Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate					1.625%

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