Debt - Credit Agreement (Details) - USD ($)	Apr. 19, 2024	Sep. 30, 2025	Sep. 30, 2024
Credit Agreement | Maximum
Debt Instrument [Line Items]
Consolidated leverage ratio	4.00
New Revolving Credit Facility | Other Currency
Debt Instrument [Line Items]
Interest rate, basis spread (as percent)	1.225%
New Revolving Credit Facility | Base Rate | USD
Debt Instrument [Line Items]
Debt instrument, floor rate (as percent)	0.00%
Interest rate, basis spread (as percent)	0.225%
New Revolving Credit Facility | SOFR | USD
Debt Instrument [Line Items]
Debt instrument, floor rate (as percent)	0.00%
Debt instrument, spread adjustment rate (as percent)	0.10%
Interest rate, basis spread (as percent)	1.225%
New Revolving Credit Facility | Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,500,000,000
New Term Loan A Facility | Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 750,000,000
New Term Loan B Facility | Base Rate
Debt Instrument [Line Items]
Debt instrument, floor rate (as percent)	0.00%
Interest rate, basis spread (as percent)	0.75%
New Term Loan B Facility | SOFR
Debt Instrument [Line Items]
Debt instrument, floor rate (as percent)	0.00%
Debt instrument, spread adjustment rate (as percent)	0.00%
Interest rate, basis spread (as percent)	1.75%
New Term Loan B Facility | Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 700,000,000
Revolving Credit Facility | Credit Agreement
Debt Instrument [Line Items]
Outstanding standby letters of credit		$ 4,400,000	$ 4,400,000
Current borrowing capacity		$ 1,495,600,000	$ 1,495,600,000